Found a calculator that returns a number you cannot reproduce by hand? Spotted a formula you think is off? Or want a tool that does not exist yet? Those are the messages I most want to receive, because they make the site better for everyone who lands here next.
Use the form below and it comes straight to me. I read every note personally and usually reply within a few business days. If you are reporting a bug, telling me the exact numbers you entered and the result you expected helps me fix it faster.
LiftingCalc is written and edited by Marcus Hale. The tools here are educational and are not a substitute for medical or dietetic advice.