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Found a calculation issue, have a suggestion for a useful calculator, or need to report a technical problem? We welcome clear, reproducible feedback.
Include the calculator name, the values you entered, the result you expected, and the browser or device you used. That makes it much easier to investigate a formula, formatting, or interaction issue.
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We read every message. Accuracy reports and corrections are prioritised.
Please don't send sensitive data. Do not include personal, medical, banking, tax, or identifying information. Calculator entries are designed to stay in your browser and do not need to be included in a message.