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Bug Reports & Technical Issues
If a calculator is producing unexpected results, a formula seems incorrect, or something is broken on the page, please include the calculator name, what you entered, and what result you got.
Feedback & Feature Requests
We build everything based on what users actually need. If there's a formula, calculator, or feature you'd like to see added, let us know. If something about the experience could be clearer or more useful, we want to hear it.
General Enquiries
Questions about our formulas, data privacy, or the site in general. For medical questions, please consult a qualified healthcare provider — our calculators are educational tools, not medical advice.
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