How do I get a human-readable file size in bytes abbreviation using NET

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How do I get a human-readable file size in bytes abbreviation using  NET   Example  Take input 7 326 629 and display 6 98 MB

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Like  NET3 s solution  Use shift instead of division to test the range of bytes  because division takes more CPU cost   private static readonly string   UNITS   new string      B    KB    MB    GB    TB    PB    EB      public static string FormatSize ulong bytes        int c   0      for  c   0  c  lt  UNITS Length  c                  ulong m    ulong 1  lt  lt    c   1    10           if  bytes  lt  m              break             double n   bytes    double   ulong 1  lt  lt   c   10        return string Format   0 0      1    n  UNITS c

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Here is a method with Log10  using System   class Program      static string NumberFormat double n          var n2    int Math Log10 n    3        var n3   n   Math Pow 1e3  n2         return String Format  quot  0 f3  quot   n3    new    quot  quot    quot  k quot    quot  M quot    quot  G quot   n2            static void Main           var s   NumberFormat 9012345678         Console WriteLine s     quot 9 012 G quot            https   docs microsoft com dotnet api system math log10

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If you are trying to match the size as shown in Windows Explorer s detail view  this is the code you want    DllImport  shlwapi dll   CharSet   CharSet Unicode   private static extern long StrFormatKBSize      long qdw       MarshalAs UnmanagedType LPTStr   StringBuilder pszBuf      int cchBuf    public static string BytesToString long byteCount        var sb   new StringBuilder 32       StrFormatKBSize byteCount  sb  sb Capacity       return sb ToString        This will not only match Explorer exactly but will also provide the strings translated for you and match differences in Windows versions  for example in Win10  K   1000 vs  previous versions K   1024

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I use the Long extension method below to convert to a human readable size string  This method is the C  implementation of the Java solution of this same question posted on Stack Overflow  here        lt summary gt      Convert a byte count into a human readable size string       lt  summary gt       lt param name  bytes  gt The byte count  lt  param gt       lt param name  si  gt Whether or not to use SI units  lt  param gt       lt returns gt A human readable size string  lt  returns gt  public static string ToHumanReadableByteCount      this long bytes       bool si         var unit   si           1000           1024       if  bytes  lt  unit                return    bytes  B              var exp    int   Math Log bytes    Math Log unit         return    bytes   Math Pow unit  exp  F2                     si    kMGTPE     KMGTPE   exp - 1     si   string Empty    i   B

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My 2 cents    The prefix for kilobyte is kB  lowercase K  Since these functions are for presentation purposes  one should supply a culture  for example  string Format CultureInfo CurrentCulture    0 0      1    fileSize  unit   Depending on the context a kilobyte can be either 1000 or 1024 bytes  The same goes for MB  GB  etc

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This is not the most efficient way to do it  but it s easier to read if you are not familiar with log maths  and should be fast enough for most scenarios   string   sizes      B    KB    MB    GB    TB     double len   new FileInfo filename  Length  int order   0  while  len  gt   1024  amp  amp  order  lt  sizes Length - 1        order        len   len 1024        Adjust the format string to your preferences  For example   0 0    1   would    show a single decimal place  and no space  string result   String Format   0 0      1    len  sizes order

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I assume you re looking for  1 4 MB  instead of  1468006 bytes    I don t think there is a built-in way to do that in  NET  You ll need to just figure out which unit is appropriate  and format it   Edit  Here s some sample code to do just that   http   www codeproject com KB cpp formatsize aspx

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int size   new FileInfo  filePath   Length   1024  string humanKBSize   string Format    0  KB   size    string humanMBSize   string Format    0  MB   size   1024    string humanGBSize   string Format    0  GB   size   1024   1024

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Like  NET3 s solution  Use shift instead of division to test the range of bytes  because division takes more CPU cost   private static readonly string   UNITS   new string      B    KB    MB    GB    TB    PB    EB      public static string FormatSize ulong bytes        int c   0      for  c   0  c  lt  UNITS Length  c                  ulong m    ulong 1  lt  lt    c   1    10           if  bytes  lt  m              break             double n   bytes    double   ulong 1  lt  lt   c   10        return string Format   0 0      1    n  UNITS c

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My 2 cents    The prefix for kilobyte is kB  lowercase K  Since these functions are for presentation purposes  one should supply a culture  for example  string Format CultureInfo CurrentCulture    0 0      1    fileSize  unit   Depending on the context a kilobyte can be either 1000 or 1024 bytes  The same goes for MB  GB  etc

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I assume you re looking for  1 4 MB  instead of  1468006 bytes    I don t think there is a built-in way to do that in  NET  You ll need to just figure out which unit is appropriate  and format it   Edit  Here s some sample code to do just that   http   www codeproject com KB cpp formatsize aspx

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One more way to skin it  without any kind of loops and with negative size support  makes sense for things like file size deltas    public static class Format       static string   sizeSuffixes              B    KB    MB    GB    TB    PB    EB    ZB    YB          public static string ByteSize long size                Debug Assert sizeSuffixes Length  gt  0            const string formatTemplate     0  1 0     2             if  size    0                        return string Format formatTemplate  null  0  sizeSuffixes 0                       var absSize   Math Abs  double size           var fpPower   Math Log absSize  1000           var intPower    int fpPower          var iUnit   intPower  gt   sizeSuffixes Length               sizeSuffixes Length - 1               intPower          var normSize   absSize   Math Pow 1000  iUnit            return string Format              formatTemplate              size  lt  0    -    null  normSize  sizeSuffixes iUnit              And here is the test suite    TestFixture  public class ByteSize        TestCase 0  Result  0 B         TestCase 1  Result    1 B         TestCase 1000  Result    1 KB         TestCase 1500000  Result    1 5 MB         TestCase -1000  Result    -1 KB         TestCase int MaxValue  Result    2 1 GB         TestCase int MinValue  Result    -2 1 GB         TestCase long MaxValue  Result    9 2 EB         TestCase long MinValue  Result    -9 2 EB        public string Format byte size long size                return Format ByteSize size

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I assume you re looking for  1 4 MB  instead of  1468006 bytes    I don t think there is a built-in way to do that in  NET  You ll need to just figure out which unit is appropriate  and format it   Edit  Here s some sample code to do just that   http   www codeproject com KB cpp formatsize aspx

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If you are trying to match the size as shown in Windows Explorer s detail view  this is the code you want    DllImport  shlwapi dll   CharSet   CharSet Unicode   private static extern long StrFormatKBSize      long qdw       MarshalAs UnmanagedType LPTStr   StringBuilder pszBuf      int cchBuf    public static string BytesToString long byteCount        var sb   new StringBuilder 32       StrFormatKBSize byteCount  sb  sb Capacity       return sb ToString        This will not only match Explorer exactly but will also provide the strings translated for you and match differences in Windows versions  for example in Win10  K   1000 vs  previous versions K   1024

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using Log to solve the problem      static String BytesToString long byteCount        string   suf      B    KB    MB    GB    TB    PB    EB       Longs run out around EB     if  byteCount    0          return  0    suf 0       long bytes   Math Abs byteCount       int place   Convert ToInt32 Math Floor Math Log bytes  1024         double num   Math Round bytes   Math Pow 1024  place   1       return  Math Sign byteCount    num  ToString     suf place       Also in c   but should be a snap to convert  Also I rounded to 1 decimal place for readability    Basically Determine the number of decimal places in Base 1024 and then divide by 1024 decimalplaces   And some samples of use and output   Console WriteLine BytesToString 9223372036854775807       Results in 8EB Console WriteLine BytesToString 0                         Results in 0B Console WriteLine BytesToString 1024                      Results in 1KB Console WriteLine BytesToString 2000000                   Results in 1 9MB Console WriteLine BytesToString -9023372036854775807      Results in -7 8EB   Edit   Was pointed out that I missed a math floor  so I incorporated it   Convert ToInt32 uses rounding  not truncating and that s why Floor is necessary   Thanks for the catch   Edit2    There were a couple of comments about negative sizes and 0 byte sizes  so I updated to handle those 2 cases

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Here s a concise answer that determines the unit automatically   public static string ToBytesCount this long bytes        int unit   1024      string unitStr    b       if  bytes  lt  unit  return string Format   0   1    bytes  unitStr       else unitStr   unitStr ToUpper        int exp    int  Math Log bytes    Math Log unit        return string Format   0         1  2    bytes   Math Pow unit  exp    KMGTPEZY  exp - 1   unitStr        b  is for bit   B  is for Byte and  KMGTPEZY  are respectively for kilo  mega  giga  tera  peta  exa  zetta and yotta  One can expand it to take ISO IEC80000 into account   public static string ToBytesCount this long bytes  bool isISO   true        int unit   1024      string unitStr    b       if   isISO  unit   1000      if  bytes  lt  unit  return string Format   0   1    bytes  unitStr       else unitStr   unitStr ToUpper        if  isISO  unitStr    i    unitStr      int exp    int  Math Log bytes    Math Log unit        return string Format   0         1  2    bytes   Math Pow unit  exp    KMGTPEZY  exp - 1   unitStr

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string   suffixes      B    KB    MB    GB    TB    PB    EB    ZB    YB     int s   0  long size   fileInfo Length   while  size  gt   1024        s        size    1024     string humanReadable   String Format   0   1    size  suffixes s

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There is one open source project which can do that and much more    7 Bits   ToString               7 b 8 Bits   ToString               1 B   5  Kilobytes   Humanize         512 B  1000  Kilobytes   ToString       1000 KB  1024  Kilobytes   Humanize       1 MB   5  Gigabytes   Humanize         512 MB  1024  Gigabytes   ToString       1 TB   http   humanizr net  bytesize  https   github com MehdiK Humanizer

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In order to get the human-readable string exactly as the user s used to in his Windows environment  you should use StrFormatByteSize    using System Runtime InteropServices       private long mFileSize    DllImport  quot Shlwapi dll quot   CharSet   CharSet Auto   public static extern int StrFormatByteSize      long fileSize       MarshalAs UnmanagedType LPTStr   StringBuilder buffer      int bufferSize        public string HumanReadableFileSize       get               var sb   new StringBuilder 20           StrFormatByteSize mFileSize  sb  20           return sb ToString             I found this here  http   csharphelper com blog 2014 07 format-file-sizes-in-kb-mb-gb-and-so-forth-in-c

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string   suffixes      B    KB    MB    GB    TB    PB    EB    ZB    YB     int s   0  long size   fileInfo Length   while  size  gt   1024        s        size    1024     string humanReadable   String Format   0   1    size  suffixes s

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DllImport    Shlwapi dll   CharSet   CharSet Auto    public static extern long StrFormatByteSize            long fileSize            MarshalAs   UnmanagedType LPTStr    StringBuilder buffer           int bufferSize           lt summary gt      Converts a numeric value into a string that represents the number expressed as a size value in bytes  kilobytes  megabytes  or gigabytes  depending on the size       lt  summary gt       lt param name  filelength  gt The numeric value to be converted  lt  param gt       lt returns gt the converted string lt  returns gt  public static string StrFormatByteSize  long filesize         StringBuilder sb   new StringBuilder  11         StrFormatByteSize  filesize  sb  sb Capacity         return sb ToString        From  http   www pinvoke net default aspx shlwapi StrFormatByteSize html

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How about some recursion   private static string ReturnSize double size  string sizeLabel      if  size  gt  1024          if  sizeLabel Length    0        return ReturnSize size   1024   KB        else if  sizeLabel     KB         return ReturnSize size   1024   MB        else if  sizeLabel     MB         return ReturnSize size   1024   GB        else if  sizeLabel     GB         return ReturnSize size   1024   TB        else       return ReturnSize size   1024   PB          else         if  sizeLabel Length  gt  0        return string Concat size ToString  0 00    sizeLabel       else       return string Concat size ToString  0 00     Bytes            Then you call it   return ReturnSize size  string Empty

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Mixture of all solutions  -            lt summary gt          Converts a numeric value into a string that represents the number expressed as a size value in bytes          kilobytes  megabytes  or gigabytes  depending on the size           lt  summary gt           lt param name  fileSize  gt The numeric value to be converted  lt  param gt           lt returns gt The converted string  lt  returns gt      public static string FormatByteSize double fileSize                FileSizeUnit unit   FileSizeUnit B          while  fileSize  gt   1024  amp  amp  unit  lt  FileSizeUnit YB                        fileSize   fileSize   1024              unit                      return string Format   0 0      1    fileSize  unit                   lt summary gt          Converts a numeric value into a string that represents the number expressed as a size value in bytes          kilobytes  megabytes  or gigabytes  depending on the size           lt  summary gt           lt param name  fileInfo  gt  lt  param gt           lt returns gt The converted string  lt  returns gt      public static string FormatByteSize FileInfo fileInfo                return FormatByteSize fileInfo Length            public enum FileSizeUnit   byte       B      KB      MB      GB      TB      PB      EB      ZB      YB

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In order to get the human-readable string exactly as the user s used to in his Windows environment  you should use StrFormatByteSize    using System Runtime InteropServices       private long mFileSize    DllImport  quot Shlwapi dll quot   CharSet   CharSet Auto   public static extern int StrFormatByteSize      long fileSize       MarshalAs UnmanagedType LPTStr   StringBuilder buffer      int bufferSize        public string HumanReadableFileSize       get               var sb   new StringBuilder 20           StrFormatByteSize mFileSize  sb  20           return sb ToString             I found this here  http   csharphelper com blog 2014 07 format-file-sizes-in-kb-mb-gb-and-so-forth-in-c

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int size   new FileInfo  filePath   Length   1024  string humanKBSize   string Format    0  KB   size    string humanMBSize   string Format    0  MB   size   1024    string humanGBSize   string Format    0  GB   size   1024   1024

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One more approach  for what it s worth  I liked  humbads optimized solution referenced above  so have copied the principle  but I ve implemented it a little differently   I suppose it s debatable as to whether it should be an extension method  since not all longs are necessarily byte sizes   but I like them  and it s somewhere I can find the method when I next need it   Regarding the units  I don t think I ve ever said  Kibibyte  or  Mebibyte  in my life  and while I m skeptical of such enforced rather than evolved standards  I suppose it ll avoid confusion in the long term   public static class LongExtensions       private static readonly long   numberOfBytesInUnit      private static readonly Func lt long  string gt    bytesToUnitConverters       static LongExtensions                 numberOfBytesInUnit   new long 6                            1L  lt  lt  10        Bytes in a Kibibyte             1L  lt  lt  20        Bytes in a Mebibyte             1L  lt  lt  30        Bytes in a Gibibyte             1L  lt  lt  40        Bytes in a Tebibyte             1L  lt  lt  50        Bytes in a Pebibyte             1L  lt  lt  60        Bytes in a Exbibyte                        Shift the long  integer  down to 1024 times its number of units  convert to a double  real number               then divide to get the final number of units  units will be in the range 1 to 1023 999          Func lt long  int  string gt  FormatAsProportionOfUnit    bytes  shift    gt     double  bytes  gt  gt  shift     1024  ToString  0                 bytesToUnitConverters   new Func lt long string gt  7                        bytes   gt  bytes ToString       B               bytes   gt  FormatAsProportionOfUnit bytes  0      KiB               bytes   gt  FormatAsProportionOfUnit bytes  10      MiB               bytes   gt  FormatAsProportionOfUnit bytes  20      GiB               bytes   gt  FormatAsProportionOfUnit bytes  30      TiB               bytes   gt  FormatAsProportionOfUnit bytes  40      PiB               bytes   gt  FormatAsProportionOfUnit bytes  50      EiB                         public static string ToReadableByteSizeString this long bytes                if  bytes  lt  0              return  -    Math Abs bytes  ToReadableByteSizeString             int counter   0          while  counter  lt  numberOfBytesInUnit Length                        if  bytes  lt  numberOfBytesInUnit counter                   return bytesToUnitConverters counter  bytes               counter                      return bytesToUnitConverters counter  bytes

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Checkout the ByteSize library  It s the System TimeSpan for bytes   It handles the conversion and formatting for you   var maxFileSize   ByteSize FromKiloBytes 10   maxFileSize Bytes  maxFileSize MegaBytes  maxFileSize GigaBytes    It also does string representation and parsing      ToString ByteSize FromKiloBytes 1024  ToString       1 MB ByteSize FromGigabytes  5  ToString         512 MB ByteSize FromGigabytes 1024  ToString       1 TB     Parsing ByteSize Parse  5b    ByteSize Parse  1 55B

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One more approach  for what it s worth  I liked  humbads optimized solution referenced above  so have copied the principle  but I ve implemented it a little differently   I suppose it s debatable as to whether it should be an extension method  since not all longs are necessarily byte sizes   but I like them  and it s somewhere I can find the method when I next need it   Regarding the units  I don t think I ve ever said  Kibibyte  or  Mebibyte  in my life  and while I m skeptical of such enforced rather than evolved standards  I suppose it ll avoid confusion in the long term   public static class LongExtensions       private static readonly long   numberOfBytesInUnit      private static readonly Func lt long  string gt    bytesToUnitConverters       static LongExtensions                 numberOfBytesInUnit   new long 6                            1L  lt  lt  10        Bytes in a Kibibyte             1L  lt  lt  20        Bytes in a Mebibyte             1L  lt  lt  30        Bytes in a Gibibyte             1L  lt  lt  40        Bytes in a Tebibyte             1L  lt  lt  50        Bytes in a Pebibyte             1L  lt  lt  60        Bytes in a Exbibyte                        Shift the long  integer  down to 1024 times its number of units  convert to a double  real number               then divide to get the final number of units  units will be in the range 1 to 1023 999          Func lt long  int  string gt  FormatAsProportionOfUnit    bytes  shift    gt     double  bytes  gt  gt  shift     1024  ToString  0                 bytesToUnitConverters   new Func lt long string gt  7                        bytes   gt  bytes ToString       B               bytes   gt  FormatAsProportionOfUnit bytes  0      KiB               bytes   gt  FormatAsProportionOfUnit bytes  10      MiB               bytes   gt  FormatAsProportionOfUnit bytes  20      GiB               bytes   gt  FormatAsProportionOfUnit bytes  30      TiB               bytes   gt  FormatAsProportionOfUnit bytes  40      PiB               bytes   gt  FormatAsProportionOfUnit bytes  50      EiB                         public static string ToReadableByteSizeString this long bytes                if  bytes  lt  0              return  -    Math Abs bytes  ToReadableByteSizeString             int counter   0          while  counter  lt  numberOfBytesInUnit Length                        if  bytes  lt  numberOfBytesInUnit counter                   return bytesToUnitConverters counter  bytes               counter                      return bytesToUnitConverters counter  bytes

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int size   new FileInfo  filePath   Length   1024  string humanKBSize   string Format    0  KB   size    string humanMBSize   string Format    0  MB   size   1024    string humanGBSize   string Format    0  GB   size   1024   1024

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using Log to solve the problem      static String BytesToString long byteCount        string   suf      B    KB    MB    GB    TB    PB    EB       Longs run out around EB     if  byteCount    0          return  0    suf 0       long bytes   Math Abs byteCount       int place   Convert ToInt32 Math Floor Math Log bytes  1024         double num   Math Round bytes   Math Pow 1024  place   1       return  Math Sign byteCount    num  ToString     suf place       Also in c   but should be a snap to convert  Also I rounded to 1 decimal place for readability    Basically Determine the number of decimal places in Base 1024 and then divide by 1024 decimalplaces   And some samples of use and output   Console WriteLine BytesToString 9223372036854775807       Results in 8EB Console WriteLine BytesToString 0                         Results in 0B Console WriteLine BytesToString 1024                      Results in 1KB Console WriteLine BytesToString 2000000                   Results in 1 9MB Console WriteLine BytesToString -9023372036854775807      Results in -7 8EB   Edit   Was pointed out that I missed a math floor  so I incorporated it   Convert ToInt32 uses rounding  not truncating and that s why Floor is necessary   Thanks for the catch   Edit2    There were a couple of comments about negative sizes and 0 byte sizes  so I updated to handle those 2 cases

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I like to use the following method  it supports up to terabytes  which is enough for most cases  but it can easily be extended    private string GetSizeString long length        long B   0  KB   1024  MB   KB   1024  GB   MB   1024  TB   GB   1024      double size   length      string suffix   nameof B        if  length  gt   TB            size   Math Round  double length   TB  2           suffix   nameof TB             else if  length  gt   GB            size   Math Round  double length   GB  2           suffix   nameof GB             else if  length  gt   MB            size   Math Round  double length   MB  2           suffix   nameof MB             else if  length  gt   KB            size   Math Round  double length   KB  2           suffix   nameof KB              return    size   suffix        Please keep in mind that this is written for C  6 0  2015   so it might need a little editing for earlier versions

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A tested and significantly optimized version of the requested function is posted here   C  Human Readable File Size - Optimized Function  Source code      Returns the human-readable file size for an arbitrary  64-bit file size     The default format is  0     XB   e g   4 2 KB  or  1 434 GB  public string GetBytesReadable long i           Get absolute value     long absolute i    i  lt  0   -i   i          Determine the suffix and readable value     string suffix      double readable      if  absolute i  gt   0x1000000000000000     Exabyte               suffix    EB           readable    i  gt  gt  50             else if  absolute i  gt   0x4000000000000     Petabyte               suffix    PB           readable    i  gt  gt  40             else if  absolute i  gt   0x10000000000     Terabyte               suffix    TB           readable    i  gt  gt  30             else if  absolute i  gt   0x40000000     Gigabyte               suffix    GB           readable    i  gt  gt  20             else if  absolute i  gt   0x100000     Megabyte               suffix    MB           readable    i  gt  gt  10             else if  absolute i  gt   0x400     Kilobyte               suffix    KB           readable   i            else               return i ToString  0 B       Byte              Divide by 1024 to get fractional value     readable    readable   1024          Return formatted number with suffix     return readable ToString  0          suffix

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One more way to skin it  without any kind of loops and with negative size support  makes sense for things like file size deltas    public static class Format       static string   sizeSuffixes              B    KB    MB    GB    TB    PB    EB    ZB    YB          public static string ByteSize long size                Debug Assert sizeSuffixes Length  gt  0            const string formatTemplate     0  1 0     2             if  size    0                        return string Format formatTemplate  null  0  sizeSuffixes 0                       var absSize   Math Abs  double size           var fpPower   Math Log absSize  1000           var intPower    int fpPower          var iUnit   intPower  gt   sizeSuffixes Length               sizeSuffixes Length - 1               intPower          var normSize   absSize   Math Pow 1000  iUnit            return string Format              formatTemplate              size  lt  0    -    null  normSize  sizeSuffixes iUnit              And here is the test suite    TestFixture  public class ByteSize        TestCase 0  Result  0 B         TestCase 1  Result    1 B         TestCase 1000  Result    1 KB         TestCase 1500000  Result    1 5 MB         TestCase -1000  Result    -1 KB         TestCase int MaxValue  Result    2 1 GB         TestCase int MinValue  Result    -2 1 GB         TestCase long MaxValue  Result    9 2 EB         TestCase long MinValue  Result    -9 2 EB        public string Format byte size long size                return Format ByteSize size

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This is not the most efficient way to do it  but it s easier to read if you are not familiar with log maths  and should be fast enough for most scenarios   string   sizes      B    KB    MB    GB    TB     double len   new FileInfo filename  Length  int order   0  while  len  gt   1024  amp  amp  order  lt  sizes Length - 1        order        len   len 1024        Adjust the format string to your preferences  For example   0 0    1   would    show a single decimal place  and no space  string result   String Format   0 0      1    len  sizes order

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I use the Long extension method below to convert to a human readable size string  This method is the C  implementation of the Java solution of this same question posted on Stack Overflow  here        lt summary gt      Convert a byte count into a human readable size string       lt  summary gt       lt param name  bytes  gt The byte count  lt  param gt       lt param name  si  gt Whether or not to use SI units  lt  param gt       lt returns gt A human readable size string  lt  returns gt  public static string ToHumanReadableByteCount      this long bytes       bool si         var unit   si           1000           1024       if  bytes  lt  unit                return    bytes  B              var exp    int   Math Log bytes    Math Log unit         return    bytes   Math Pow unit  exp  F2                     si    kMGTPE     KMGTPE   exp - 1     si   string Empty    i   B

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string   suffixes      B    KB    MB    GB    TB    PB    EB    ZB    YB     int s   0  long size   fileInfo Length   while  size  gt   1024        s        size    1024     string humanReadable   String Format   0   1    size  suffixes s

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A tested and significantly optimized version of the requested function is posted here   C  Human Readable File Size - Optimized Function  Source code      Returns the human-readable file size for an arbitrary  64-bit file size     The default format is  0     XB   e g   4 2 KB  or  1 434 GB  public string GetBytesReadable long i           Get absolute value     long absolute i    i  lt  0   -i   i          Determine the suffix and readable value     string suffix      double readable      if  absolute i  gt   0x1000000000000000     Exabyte               suffix    EB           readable    i  gt  gt  50             else if  absolute i  gt   0x4000000000000     Petabyte               suffix    PB           readable    i  gt  gt  40             else if  absolute i  gt   0x10000000000     Terabyte               suffix    TB           readable    i  gt  gt  30             else if  absolute i  gt   0x40000000     Gigabyte               suffix    GB           readable    i  gt  gt  20             else if  absolute i  gt   0x100000     Megabyte               suffix    MB           readable    i  gt  gt  10             else if  absolute i  gt   0x400     Kilobyte               suffix    KB           readable   i            else               return i ToString  0 B       Byte              Divide by 1024 to get fractional value     readable    readable   1024          Return formatted number with suffix     return readable ToString  0          suffix

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I assume you re looking for  1 4 MB  instead of  1468006 bytes    I don t think there is a built-in way to do that in  NET  You ll need to just figure out which unit is appropriate  and format it   Edit  Here s some sample code to do just that   http   www codeproject com KB cpp formatsize aspx

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Here is a method with Log10  using System   class Program      static string NumberFormat double n          var n2    int Math Log10 n    3        var n3   n   Math Pow 1e3  n2         return String Format  quot  0 f3  quot   n3    new    quot  quot    quot  k quot    quot  M quot    quot  G quot   n2            static void Main           var s   NumberFormat 9012345678         Console WriteLine s     quot 9 012 G quot            https   docs microsoft com dotnet api system math log10

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Checkout the ByteSize library  It s the System TimeSpan for bytes   It handles the conversion and formatting for you   var maxFileSize   ByteSize FromKiloBytes 10   maxFileSize Bytes  maxFileSize MegaBytes  maxFileSize GigaBytes    It also does string representation and parsing      ToString ByteSize FromKiloBytes 1024  ToString       1 MB ByteSize FromGigabytes  5  ToString         512 MB ByteSize FromGigabytes 1024  ToString       1 TB     Parsing ByteSize Parse  5b    ByteSize Parse  1 55B

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How about some recursion   private static string ReturnSize double size  string sizeLabel      if  size  gt  1024          if  sizeLabel Length    0        return ReturnSize size   1024   KB        else if  sizeLabel     KB         return ReturnSize size   1024   MB        else if  sizeLabel     MB         return ReturnSize size   1024   GB        else if  sizeLabel     GB         return ReturnSize size   1024   TB        else       return ReturnSize size   1024   PB          else         if  sizeLabel Length  gt  0        return string Concat size ToString  0 00    sizeLabel       else       return string Concat size ToString  0 00     Bytes            Then you call it   return ReturnSize size  string Empty

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string   suffixes      B    KB    MB    GB    TB    PB    EB    ZB    YB     int s   0  long size   fileInfo Length   while  size  gt   1024        s        size    1024     string humanReadable   String Format   0   1    size  suffixes s

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There is one open source project which can do that and much more    7 Bits   ToString               7 b 8 Bits   ToString               1 B   5  Kilobytes   Humanize         512 B  1000  Kilobytes   ToString       1000 KB  1024  Kilobytes   Humanize       1 MB   5  Gigabytes   Humanize         512 MB  1024  Gigabytes   ToString       1 TB   http   humanizr net  bytesize  https   github com MehdiK Humanizer

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I like to use the following method  it supports up to terabytes  which is enough for most cases  but it can easily be extended    private string GetSizeString long length        long B   0  KB   1024  MB   KB   1024  GB   MB   1024  TB   GB   1024      double size   length      string suffix   nameof B        if  length  gt   TB            size   Math Round  double length   TB  2           suffix   nameof TB             else if  length  gt   GB            size   Math Round  double length   GB  2           suffix   nameof GB             else if  length  gt   MB            size   Math Round  double length   MB  2           suffix   nameof MB             else if  length  gt   KB            size   Math Round  double length   KB  2           suffix   nameof KB              return    size   suffix        Please keep in mind that this is written for C  6 0  2015   so it might need a little editing for earlier versions

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int size   new FileInfo  filePath   Length   1024  string humanKBSize   string Format    0  KB   size    string humanMBSize   string Format    0  MB   size   1024    string humanGBSize   string Format    0  GB   size   1024   1024

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Mixture of all solutions  -            lt summary gt          Converts a numeric value into a string that represents the number expressed as a size value in bytes          kilobytes  megabytes  or gigabytes  depending on the size           lt  summary gt           lt param name  fileSize  gt The numeric value to be converted  lt  param gt           lt returns gt The converted string  lt  returns gt      public static string FormatByteSize double fileSize                FileSizeUnit unit   FileSizeUnit B          while  fileSize  gt   1024  amp  amp  unit  lt  FileSizeUnit YB                        fileSize   fileSize   1024              unit                      return string Format   0 0      1    fileSize  unit                   lt summary gt          Converts a numeric value into a string that represents the number expressed as a size value in bytes          kilobytes  megabytes  or gigabytes  depending on the size           lt  summary gt           lt param name  fileInfo  gt  lt  param gt           lt returns gt The converted string  lt  returns gt      public static string FormatByteSize FileInfo fileInfo                return FormatByteSize fileInfo Length            public enum FileSizeUnit   byte       B      KB      MB      GB      TB      PB      EB      ZB      YB

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This is not the most efficient way to do it  but it s easier to read if you are not familiar with log maths  and should be fast enough for most scenarios   string   sizes      B    KB    MB    GB    TB     double len   new FileInfo filename  Length  int order   0  while  len  gt   1024  amp  amp  order  lt  sizes Length - 1        order        len   len 1024        Adjust the format string to your preferences  For example   0 0    1   would    show a single decimal place  and no space  string result   String Format   0 0      1    len  sizes order

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This is not the most efficient way to do it  but it s easier to read if you are not familiar with log maths  and should be fast enough for most scenarios   string   sizes      B    KB    MB    GB    TB     double len   new FileInfo filename  Length  int order   0  while  len  gt   1024  amp  amp  order  lt  sizes Length - 1        order        len   len 1024        Adjust the format string to your preferences  For example   0 0    1   would    show a single decimal place  and no space  string result   String Format   0 0      1    len  sizes order

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Here s a concise answer that determines the unit automatically   public static string ToBytesCount this long bytes        int unit   1024      string unitStr    b       if  bytes  lt  unit  return string Format   0   1    bytes  unitStr       else unitStr   unitStr ToUpper        int exp    int  Math Log bytes    Math Log unit        return string Format   0         1  2    bytes   Math Pow unit  exp    KMGTPEZY  exp - 1   unitStr        b  is for bit   B  is for Byte and  KMGTPEZY  are respectively for kilo  mega  giga  tera  peta  exa  zetta and yotta  One can expand it to take ISO IEC80000 into account   public static string ToBytesCount this long bytes  bool isISO   true        int unit   1024      string unitStr    b       if   isISO  unit   1000      if  bytes  lt  unit  return string Format   0   1    bytes  unitStr       else unitStr   unitStr ToUpper        if  isISO  unitStr    i    unitStr      int exp    int  Math Log bytes    Math Log unit        return string Format   0         1  2    bytes   Math Pow unit  exp    KMGTPEZY  exp - 1   unitStr

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DllImport    Shlwapi dll   CharSet   CharSet Auto    public static extern long StrFormatByteSize            long fileSize            MarshalAs   UnmanagedType LPTStr    StringBuilder buffer           int bufferSize           lt summary gt      Converts a numeric value into a string that represents the number expressed as a size value in bytes  kilobytes  megabytes  or gigabytes  depending on the size       lt  summary gt       lt param name  filelength  gt The numeric value to be converted  lt  param gt       lt returns gt the converted string lt  returns gt  public static string StrFormatByteSize  long filesize         StringBuilder sb   new StringBuilder  11         StrFormatByteSize  filesize  sb  sb Capacity         return sb ToString        From  http   www pinvoke net default aspx shlwapi StrFormatByteSize html

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DllImport    Shlwapi dll   CharSet   CharSet Auto    public static extern long StrFormatByteSize            long fileSize            MarshalAs   UnmanagedType LPTStr    StringBuilder buffer           int bufferSize           lt summary gt      Converts a numeric value into a string that represents the number expressed as a size value in bytes  kilobytes  megabytes  or gigabytes  depending on the size       lt  summary gt       lt param name  filelength  gt The numeric value to be converted  lt  param gt       lt returns gt the converted string lt  returns gt  public static string StrFormatByteSize  long filesize         StringBuilder sb   new StringBuilder  11         StrFormatByteSize  filesize  sb  sb Capacity         return sb ToString        From  http   www pinvoke net default aspx shlwapi StrFormatByteSize html

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DllImport    Shlwapi dll   CharSet   CharSet Auto    public static extern long StrFormatByteSize            long fileSize            MarshalAs   UnmanagedType LPTStr    StringBuilder buffer           int bufferSize           lt summary gt      Converts a numeric value into a string that represents the number expressed as a size value in bytes  kilobytes  megabytes  or gigabytes  depending on the size       lt  summary gt       lt param name  filelength  gt The numeric value to be converted  lt  param gt       lt returns gt the converted string lt  returns gt  public static string StrFormatByteSize  long filesize         StringBuilder sb   new StringBuilder  11         StrFormatByteSize  filesize  sb  sb Capacity         return sb ToString        From  http   www pinvoke net default aspx shlwapi StrFormatByteSize html

[c#] How do I get a human-readable file size in bytes abbreviation using .NET?

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