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Report a problem
If a calculator gives a wrong answer, please include:
- The calculator name and URL
- The inputs you used
- The result you got and the result you expected
- The source you're comparing against (Wikipedia, textbook, official standard)
We treat numerical accuracy as a bug, not an opinion — a confirmed mistake gets fixed and the test suite updated.
Suggest a calculator
Tell us what calculator you wish existed. Helpful details:
- What problem does it solve?
- Who would use it?
- Do you have a link to an authoritative formula or standard?
Press / partnerships
For press, embeds, or partnership inquiries, email the address above with [Partnership] in the subject line.