Contact

We're here
to help.

Have a question about a calculator, found a bug, or want to collaborate? We typically respond within one business day.

Response Time

We aim to reply within one business day.

Mon – Fri, 9:00 – 17:00 CET

Bug Reports

Found something that doesn't add up? Tell us which calculator and what you expected — we'll look into it.

Report a bug →

Partnership & Business

Affiliate, sponsorship or integration inquiries — we'd love to hear from you.

Get in touch →