Contact

The fastest way to reach calculaterun is by email.

What to include

Reporting a calculation error. Send the exact inputs you used, the output you received, and the output you expected, with your reasoning. Formula disputes are settled with arithmetic, and having your numbers makes that quick.

Suggesting a calculator. Describe the decision you are trying to make, not just the tool you want. The useful tools on this site came from specific problems rather than from feature lists.

Corrections to articles. A citation to the contradicting source is more persuasive than an assertion, and corrections are published rather than quietly edited. See the editorial policy.

Advertising and commercial enquiries. Display advertising on this site is handled through Google AdSense. Direct sponsorship of content is not accepted.

Response times

This is an independently run site, not a company with a support desk. Expect a reply within a few days rather than a few hours. Reports of a genuine calculation error are prioritised over everything else.

Privacy of correspondence

Email you send is used only to answer you. It is not added to a mailing list, sold, or shared. See the privacy policy.