Code Quality Rank: L4
Programming language: C#
License: MIT License
Tags: Misc     Bytes    
Latest version: v2.1.1

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ByteSize is a utility class that makes byte size representation in code easier by removing ambiguity of the value being represented.

ByteSize is to bytes what System.TimeSpan is to time.

Stable nuget


v2 Breaking Changes


By default ByteSize now assumes 1 KB == 1000 B and 1 KiB == 1024 B to adhere to the IEC and NIST standards (https://en.wikipedia.org/wiki/Binary_prefix). In version 1 ByteSize assumed 1 KB == 1024 B, that means if you're upgrading from v1, you'll see differences in values.

When you upgrade an existing application to v2 your existing code will be using the decimal representation of bytes (i.e. 1 KB == 1000 B). If the difference in calculation is not material to your application, you don't need to change anything.

However, if you want to use 1 KiB == 1024 B, then you'll need to change all ByteSize calls to the respective method. For example, calls to ByteSize.FromKiloByte need to be changed to ByteSize.FromKibiByte.

Lastly, ByteSize no longer supports the ratio of 1 KB == 1024 B. Note this is kilobytes to bytes. The only ratio of 1 == 1024 is kibibytes to bytes.

Other Breaking Changes

  • Renamed property LargestWholeNumberSymbol and LargestWholeNumberValue to LargestWholeNumberDecimalSymbol and LargestWholeNumberDecimalValue respectively.
  • Drop support for all platforms except netstandard1.0 and net45.


ByteSize adheres to the IEC standard, see this Wikipedia article. That means ByteSize assumes:

  • Decimal representation: 1 kilobyte = 1000 bytes with 2 letter abbrevations b, B,KB, MB, GB, TB, PB.
  • Binary representation: 1 kibibyte = 1024 bytes with 3 letter abbrevations b, B,KiB, MiB, GiB, TiB, PiB.

ByteSize manages conversion of the values internally and provides methods to create and retrieve the values as needed. See the examples below.


Without ByteSize:

double maxFileSizeMBs = 1.5;

// I need it in KBs and KiBs!
var kilobytes = maxFileSizeMBs * 1000; // 1500
var kibibytes = maxFileSizeMBs * 1024; // 1536

With ByteSize:

var maxFileSize = ByteSize.FromMegaBytes(1.5);

// I have it in KBs and KiBs!!
maxFileSize.KiloBytes;  // 1500
maxFileSize.KibiBytes;  // 1464.84376

ByteSize behaves like any other struct backed by a numerical value allowing arithmetic operations between two objects.

// Add
var monthlyUsage = ByteSize.FromGigaBytes(10);
var currentUsage = ByteSize.FromMegaBytes(512);
ByteSize total = monthlyUsage + currentUsage;


// Subtract
var delta = total.Subtract(ByteSize.FromKiloBytes(10));
delta = delta - ByteSize.FromGigaBytes(100);
delta = delta.AddMegaBytes(-100);

// Multiple
var multiple = ByteSize.FromBytes(4) * ByteSize.FromBytes(2); // 8

// Divide
var divide = ByteSize.FromBytes(16) / ByteSize.FromBytes(8); // 2


You can create a ByteSize object from bits, bytes, kilobytes, megabytes, gigabytes, and terabytes.

new ByteSize(15);            // Constructor takes in bits (long)
new ByteSize(1.5);           // ... or bytes (double)

// Static Constructors
ByteSize.FromBits(10);       // Same as constructor
ByteSize.FromBytes(1.5);     // Same as constructor

// Decimal: 1 KB = 1000 B

// Binary: 1 KiB = 1024 B


A ByteSize object contains representations in:

  • bits, bytes
  • kilobytes, megabytes, gigabytes, and terabytes
  • kibibytes, mebibytes, gibibytes, and tebibytes
var maxFileSize = ByteSize.FromKiloBytes(10);

maxFileSize.Bits;      // 80000
maxFileSize.Bytes;     // 10000

// Decimal
maxFileSize.KiloBytes; // 10
maxFileSize.MegaBytes; // 0.01
maxFileSize.GigaBytes; // 1E-05
maxFileSize.TeraBytes; // 1E-08

// Binary
maxFileSize.KibiBytes; // 9.765625
maxFileSize.MebiBytes; // 0.0095367431640625
maxFileSize.GibiBytes; // 9.31322574615479E-06
maxFileSize.TebiBytes; // 9.09494701772928E-09

A ByteSize object also contains four properties that represent the largest whole number symbol and value.

var maxFileSize = ByteSize.FromKiloBytes(10);

maxFileSize.LargestWholeNumberDecimalSymbol; // "KB"
maxFileSize.LargestWholeNumberDecimalValue;  // 10
maxFileSize.LargestWholeNumberBinarySymbol;  // "KiB"
maxFileSize.LargestWholeNumberBinaryValue;   // 9.765625

String Representation

By default a ByteSize object uses the decimal value for string representation.

All string operations are localized to use the number decimal separator of the culture set in Thread.CurrentThread.CurrentCulture.


ByteSize comes with a handy ToString method that uses the largest metric prefix whose value is greater than or equal to 1.

// By default the decimal values are used
ByteSize.FromBits(7).ToString();         // 7 b
ByteSize.FromBits(8).ToString();         // 1 B
ByteSize.FromKiloBytes(.5).ToString();   // 500 B
ByteSize.FromKiloBytes(999).ToString();  // 999 KB
ByteSize.FromKiloBytes(1000).ToString(); // 1 MB
ByteSize.FromGigabytes(.5).ToString();   // 500 MB
ByteSize.FromGigabytes(1000).ToString(); // 1 TB

// Binary
ByteSize.Parse("1.55 kb").ToString("kib"); // 1.51 kib


The ToString method accepts a single string parameter to format the output. The formatter can contain the symbol of the value to display.

  • Base: b, B
  • Decimal: KB, MB, GB, TB
  • Binary: KiB, MiB, GiB, TiB

The formatter uses the built in double.ToString method.

The default number format is 0.## which rounds the number to two decimal places and outputs only 0 if the value is 0.

You can include symbol and number formats.

var b = ByteSize.FromKiloBytes(10.505);

// Default number format is 0.##
b.ToString("KB");         // 10.52 KB
b.ToString("MB");         // .01 MB
b.ToString("b");          // 86057 b

// Default symbol is the largest metric prefix value >= 1
b.ToString("#.#");        // 10.5 KB

// All valid values of double.ToString(string format) are acceptable
b.ToString("0.0000");     // 10.5050 KB
b.ToString("000.00");     // 010.51 KB

// You can include number format and symbols
b.ToString("#.#### MB");  // .0103 MB
b.ToString("0.00 GB");    // 0 GB
b.ToString("#.## B");     // 10757.12 B

// ByteSize object of value 0
var zeroBytes = ByteSize.FromKiloBytes(0); 
zeroBytes.ToString();           // 0 b
zeroBytes.ToString("0 kb");     // 0 kb
zeroBytes.ToString("0.## mb");  // 0 mb


ByteSize has a Parse and TryParse method similar to other base classes.

Like other TryParse methods, ByteSize.TryParse returns boolean value indicating whether or not the parsing was successful. If the value is parsed it is output to the out parameter supplied.

ByteSize output;
ByteSize.TryParse("1.5mb", out output);
ByteSize.TryParse("1.5mib", out output);

// Invalid
ByteSize.Parse("1.5 b");   // Can't have partial bits

// Valid
ByteSize.Parse("1.55 kB "); // Spaces are trimmed
ByteSize.Parse("1.55 kb");
ByteSize.Parse("1.55 MB");
ByteSize.Parse("1.55 mB");
ByteSize.Parse("1.55 mb");
ByteSize.Parse("1.55 GB");
ByteSize.Parse("1.55 gB");
ByteSize.Parse("1.55 gib");
ByteSize.Parse("1.55 TiB");
ByteSize.Parse("1.55 tiB");
ByteSize.Parse("1.55 tib");
ByteSize.Parse("1,55 kib"); // de-DE culture

Author and License

Omar Khudeira (http://omar.io)

Copyright (c) 2013-2022 Omar Khudeira. All rights reserved.

Released under MIT License (see LICENSE file).

*Note that all licence references and agreements mentioned in the ByteSize README section above are relevant to that project's source code only.