fend

fend is an arbitrary-precision unit-aware calculator.

Unique features:

• Arbitrary-precision arithmetic using rational numbers
• Full support for complex numbers
• D&D-style dice rolls
• Variables
• Binary, octal, hexadecimal and all other bases between 2 and 36
• Keep track of units, with support for SI, US and UK customary and many historical units
• Emacs-style CLI shortcuts
• Trigonometric functions
• Lambda calculus

See the manual for more information.

Web Interface

fend is available on the web at printfn.github.io/fend-website.

Installation

The easiest way to install fend locally is via your package manager.

On macOS (using Homebrew):

brew install printfn/fend/fend

On Arch Linux (using yay):

yay -Syu aur/fend-bin

Using the nix package manager:

nix-env -iA nixpkgs.fend

On systems with Rust:

rustup update
cargo install fend

You can also download the latest stable binaries here.

Once fend is installed, run fend to start a REPL session:

$ fend
> 1 ft to cm
30.48 cm
>

Packages

• Homebrew
• AUR (built from source)
• AUR (pre-built binary)
• nixpkgs
• NPM fend-wasm package
• NPM fend-wasm-web package
• NPM fend-wasm-nodejs package
• Telegram Bot

Manual

You can find the fend manual here.

Examples

> 5'10" to cm
177.8 cm

> cos (pi/4) + i * (sin (pi/4))
approx. 0.7071067811 + 0.7071067811i

> 0b1001 + 3
0b1100

> 0xffff to decimal
65535

> 100 °C to °F
210 °F

> 1 lightyear to parsecs
approx. 0.3066013937 parsecs

> temperature = 30 °C
30 °C
> temperature to °F
86 °F

> roll d20
8
> roll 4d6
17

License

fend is MIT-licensed. See LICENSE.md for more information.