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Found a wrong answer, want a new calculator, or have feedback? We read every message.
Last updated October 23, 2026
Write to us at [email protected]. This is the only way to reach us, and it covers everything below.
What to write to us about
- Wrong or unexpected result. Tell us which calculator, the values you entered, the result you got and the one you expected. Corrections are fixed first.
- New calculator request. Describe what you want to calculate and, if you can, an example with the correct answer.
- Feedback and bugs. Layout problems, broken links or anything confusing. Include your device and browser if it is a display issue.
- Privacy questions. See the privacy policy, then email us if you need more.
What to expect
We aim to reply within a few business days. We cannot give personal financial, tax, medical or legal advice. Calculators are informational tools, and for decisions that matter you should consult a qualified professional.
Before you write
Formulas, data sources and update schedules are published on How we calculate, and may already answer your question. You can learn more about the site on the about page.