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Questions about a calculation, a correction, a suggestion for a new calculator, or a business inquiry, we read everything. The fastest way to reach us is email.

Before you write

• Calculation questions: each calculator page explains its exact formula with a worked example under the tool, the answer is often right there.
• Corrections: if you believe a constant or formula is wrong, please include the calculator name, the inputs you used, and the result you expected. We take accuracy reports seriously and investigate every one.
• Advertising & privacy: for questions about the ads on this site or how your data is handled, see our privacy policy first, it covers the most common questions.

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