Contact
We read every message. Whether you've spotted an incorrect figure, want to suggest a new calculator, or have a question about how a result was produced, here's how to reach us.
The fastest way to reach us is by email at hello@online-calc.com. We aim to respond within a few business days.
What to include
- Reporting an error: tell us which calculator, the inputs you used, and the result you expected - it helps us reproduce and fix the issue quickly.
- Suggesting a calculator: describe the calculation and, if you can, link to the official source or formula.
- Privacy or data requests: see our Privacy Policy for your rights and how to exercise them.
Send a message
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