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Found a bug, spotted a formula error, have a calculator request, or want to talk partnerships? We read everything, and we typically reply within 2 business days.

General questions: hello@docalc.net. Found an error on a calculator or article? Report it directly to support@docalc.net — see how we handle corrections on our Editorial Policy page.

Want to know who's on the other end of this form? See our Editorial Team page. For what our calculators are (and aren't) a substitute for, read our Disclaimer.