Mortgage Extra Payments Calculator

Web calculator with user-defined variables and functions, complex numbers, derivatives and integrals.

Scientific calculator language that tracks physical dimensions and units in every calculation.

Notepad-style calculator where each line is evaluated live, with units, percentages and variables.

Web version of an arbitrary-precision calculator that understands units, currencies and conversions.

Web calculator for planning production chains in factory games such as Factorio and Dyson Sphere Program.

Calculator that works with ranges and uncertain numbers instead of exact values.