Contact
Questions, feedback, a bug to report, or a calculator you’d like to see? We’d love to hear from you.
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The fastest way to reach us is by email. We typically reply within a few business days.
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Before you write
- Bug reports: please include the calculator name and the values you entered so we can reproduce the issue.
- Calculator requests: tell us what you need and why — we prioritize based on how many people ask.
- Corrections: if a formula looks wrong, a source or reference link helps a lot.
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