About this site

This is a small independent project: a growing set of free calculators for people who build and operate software — founders, freelancers, and engineers.

Every tool is designed to answer one specific question well, run entirely in your browser, and load fast. There are no accounts, and the numbers you enter are never sent to a server.

Why it exists

Most calculators for these topics are thin widgets buried inside long blog posts, or locked behind a paid product. The goal here is a clean, standalone tool for each one, with the formulas and benchmarks shown openly so you can check the maths yourself.

Accuracy & disclaimer

These tools are for estimation and education only. They are not financial, tax, investment, or accounting advice. Always confirm important numbers with a qualified professional and your own records.

Found a bug or a formula you disagree with? Get in touch.