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.

Installation

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

Package Manager	Command
Homebrew	brew install fend
MacPorts	sudo port install fend
AUR (Arch Linux)	yay -S aur/fend-bin
AOSC OS	oma install fend
Xbps (Void Linux)	xbps-install fend
Nix	Add nixpkgs.fend to your config, or install ephemerally using nix-shell -p fend.
Cargo	cargo install fend
Windows Package Manager	winget install fend
Chocolatey	choco install fend
Scoop	scoop install fend
Pkgx	pkgx fend

Alternatively, you can manually 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
• MacPorts
• AUR (built from source)
• AUR (pre-built binary)
• xbps
• AOSC OS
• nixpkgs
• Windows Package Manager
• Chocolatey
• NPM fend-wasm package
• NPM fend-wasm-web package
• NPM fend-wasm-nodejs package
• Telegram Bot
• Pkgx

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

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

> roll d20
8
> roll 4d6
17

Projects using fend

These are some projects making use of fend:

• MicroPad
• Fendesk
• metasearch2
• FendApp
• Asleh

Feel free to make a pull request to add your own!

License

fend is available under the MIT license. See LICENSE.md for more information.