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What's your message about?
🐛 Report an Error
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❓ General Question
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Common Questions Before You Write
How long does it take to get a reply?
We aim to respond to all genuine enquiries within 1–2 business days. Complex technical reports or advertising discussions may take a little longer. We read every message personally.
I found a wrong answer in one of your calculators. What should I do?
Please use the contact form above, select "Report a calculation error," and tell us which calculator produced the wrong answer, what values you entered, and what result you expected. Include a source if you have one. We investigate all accuracy reports and fix confirmed errors quickly.
Can I request a new calculator to be added?
Absolutely — we love suggestions. Select "Suggest a new calculator" and describe what you need. We prioritize requests that come up frequently. Popular suggestions usually make it onto the roadmap within a few weeks.
Do you offer advertising or sponsorship opportunities?
Yes. Select "Advertising enquiry" in the form and describe what you have in mind. We consider relevant, non-intrusive placements that genuinely serve our audience. We do not accept ads for prohibited content categories.
Can I use your calculators on my own website?
Please contact us to discuss. Embedding individual calculators via link is generally fine. Scraping, copying, or reproducing our content or code without permission is not permitted under our Terms of Use.