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.

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

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

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
>

• 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

You can find the fend manual here.

> 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

These are some projects making use of fend:

• MicroPad
• Fendesk
• metasearch2

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

fend is licensed under the GPL 3.0 (or later). See LICENSE.md for more information.