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We would like to hear from you. Send us a message if you want to report a calculation error, suggest a new tool, ask about the developer API, or raise a privacy or copyright concern.
What to include
- The name of the tool and the page address.
- The values you entered and the result you expected.
- Your browser and device, if the problem looks like a display issue.
We aim to reply within a few business days. We cannot give personal financial, tax or legal advice.