fend is an arbitrary-precision unit-aware calculator.

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 212 °F > 1 lightyear to parsecs approx. 0.3066013937 parsecs give it a go: