Contact

We read every message and fix wrong results quickly.

Reporting an error

Please include the calculator name, the exact values you entered, the result you got, and the result you expected. That is usually enough for us to reproduce it immediately.

Suggesting a calculator

Tell us the question you needed answered and the formula you would trust. We prioritise tools with a clear, verifiable calculation.

Advertising

For advertising, sponsorship, or partnership enquiries, email the address above with "Advertising" in the subject line.

Response time

We aim to reply within a few business days.