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If you believe a calculator gave an incorrect or unexpected result, please include:

• the name of the calculator;
• the exact input values you used;
• the result the calculator showed;
• the result you expected, and briefly why (e.g., “I expected X because the formula should account for Y”).

This lets us reproduce the issue quickly and, if needed, publish a correction — see our Editorial Policy.

Have an idea for a calculator we don’t yet have? Tell us what it should calculate, and if possible, a rough example of the inputs and output you’d expect. We review all suggestions, though we can’t guarantee every request will be built.

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