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Found a calculation that looks wrong, or want a tool added? Tell us.
What to include in a bug report
- The tool name (for example, Profit Margin Calculator).
- The exact numbers you entered.
- The result you got and the result you expected.
Please do not send passwords, payment details, or other confidential information.
Before you write
Many questions are answered in the FAQ at the bottom of each tool page. For how we handle data, see the Privacy Policy.