BigSharp 1.0.0

There is a newer version of this package available.
See the version list below for details.
dotnet add package BigSharp --version 1.0.0
NuGet\Install-Package BigSharp -Version 1.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="BigSharp" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add BigSharp --version 1.0.0
#r "nuget: BigSharp, 1.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install BigSharp as a Cake Addin
#addin nuget:?package=BigSharp&version=1.0.0

// Install BigSharp as a Cake Tool
#tool nuget:?package=BigSharp&version=1.0.0


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Big in C#. Port of big.js. Public domain.

A small, fast C# library for arbitrary-precision decimal arithmetic.



The primary goal of this project is to produce a translation of big.js to C# which is as close as possible to the original implementation.


  • Simple API
  • No dependencies
  • Stores values in an accessible decimal floating point format
  • Comprehensive documentation and test set


You can install BigSharp via NuGet:

package manager:

$ PM> Install-Package BigSharp


$ dotnet add package BigSharp

or download source code.


In the code examples below, semicolons and ToString calls are not shown.

The library exports a constructor function, Big.

A Big number is created from a primitive number, string, or other Big number.

x = new Big(123.4567)
y = new Big("123456.7e-3")
z = new Big(x)
x.Eq(y) && x.Eq(z) && y.Eq(z)          // true

In Big strict mode, creating a Big number from a primitive number is disallowed.

Big.STRICT = true
x = new Big(1)                         // TypeError: [BigSharp] Invalid number
y = new Big("1.0000000000000001")
y.ToNumber()                           // Error: [BigSharp] Imprecise conversion

A Big number is immutable in the sense that it is not changed by its methods.

0.3 - 0.1                              // 0.19999999999999998
x = new Big(0.3)
x.Minus(0.1)                           // "0.2"
x                                      // "0.3"

The methods that return a Big number can be chained.

x.Sqrt().Div(y).Pow(3).Gt(y.Mod(z))    // true

There are ToExponential, ToFixed and ToPrecision methods.

x = new Big(255.5)
x.ToExponential(5)                     // "2.55500e+2"
x.ToFixed(5)                           // "255.50000"
x.ToPrecision(5)                       // "255.50"

The arithmetic methods always return the exact result except Div, Sqrt and Pow (with negative exponent), as these methods involve division.

The maximum number of decimal places and the rounding mode used to round the results of these methods is determined by the value of the DP and RM properties of the Big number constructor.

Big.DP = 10
Big.RM = RoundingMode.ROUND_HALF_UP

x = new Big(2);
y = new Big(3);
z = x.Div(y)                           // "0.6666666667"
z.Sqrt()                               // "0.8164965809"
z.Pow(-3)                              // "3.3749999995"
z.Times(z)                             // "0.44444444448888888889"
z.Times(z).Round(10)                   // "0.4444444445"

The value of a Big number is stored in a decimal floating point format in terms of a coefficient, exponent and sign.

x = new Big(-123.456);
x.c                                    // [1,2,3,4,5,6]    coefficient (i.e. significand)
x.e                                    // 2                exponent
x.s                                    // -1               sign

For advanced usage, multiple Big number constructors can be created, each with an independent configuration.

For further information see the API reference documentation.

System requirements

BNSharp supports:

  • Net 6

Development and testing

Make sure to rebuild projects every time you change code for testing.


To run tests:

$ dotnet test



Product Compatible and additional computed target framework versions.
.NET net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.
  • net6.0

    • No dependencies.

NuGet packages (1)

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Adds a ToFormat instance method to Big.

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Version Downloads Last updated
2.0.1 470 7/12/2022
2.0.0 389 7/12/2022
1.0.0 397 6/23/2022