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The best way to reach us is email: contact@fastcalc.us. A real person reads every message.

Found a mistake? Tell us which calculator it's on and the numbers you plugged in. If you're comparing our answer to a code book, standard or textbook, let us know which one, since that helps us track it down a lot faster.

We're also happy to hear about calculators you'd like us to build, or anything else you think the site is missing.