Contact LeverLab

LeverLab is a small, independent, ad-supported site — there is no support team standing by, but a real person reads what comes in to support@worldlever.com.

A few things this address is genuinely useful for: a calculator that gave you a result you think is wrong (say which tool — the lever calculator, pulley calculator, gear ratio calculator, inclined plane calculator, wheel & axle calculator, or screw calculator— and what you entered); a simple machine or worked example you wish the site covered; an out-of-date fact or broken link in the blog, learn section, or the Museum of Simple Machines; or a bug in how a page looks or behaves on your device.

There’s no fixed response time to promise, and no ticket number or live chat — email is read and handled as it comes in. If a question is really about a specific real-world machine, a load rating, or a safety-critical design decision, a qualified engineer or the equipment’s manufacturer will have a more authoritative answer than this site can give; LeverLab’s tools produce general, idealized physics estimates, not professional engineering calculations.

Before writing in about a tool result, it can help to double-check the numbers you entered — arm lengths, tooth counts, ramp dimensions, and radii are the most common source of a surprising answer. If it still looks wrong after that, that’s exactly the kind of message worth sending.