Contact

Last updated October 3, 2026

The fastest way to reach us is email: [email protected].

Reporting a wrong answer

Please include the calculator name, the exact input you entered, the result you saw and the result you expected. Reproducible reports are fixed first, and the fix is covered by a new test.

Suggesting a calculator

Tell us the problem you are trying to solve and a typical example. We add tools only when we can make the working clear and test the result.