Contact
Questions, corrections, and suggestions are all welcome — especially if you think a result is wrong.
Reporting an incorrect result
Accuracy matters more than anything else here. If a number looks wrong, please tell us which calculator you used, the exact values you entered, and the result you expected. That is usually enough for us to reproduce and fix the issue quickly.
Suggesting a calculator
If a calculation you need is missing, send a short description of it and, where relevant, the formula or standard it should follow. Suggestions that come with a source are the fastest to add.
How to reach us
Email is the best way to get a reply. We read everything, though we cannot promise individual responses to every message.