ShopFloorCalc is a collection of free calculators and reference tools for tradespeople and engineers. The site covers metalworking, welding, HVAC, plumbing, electrical, and general industrial calculations — the kind of numbers you reach for at a job site, in front of a machine, or while specifying a job.
Every tool is built as a single, fast-loading page with the formulas, examples, and reference values clearly cited. No accounts, no paywalls, no popups. The goal is straightforward: get the right answer, show the source, and get out of the way. Each calculator is verified against published industry references such as ASM, AWS, ASHRAE, NEC, and ASME so the numbers can be trusted on real work.
The site is independently built and maintained. New tools are added as they prove useful, and existing tools are revised when better source data is available or when readers report issues. If a calculation is wrong, a unit is missing, or a formula needs a citation, that feedback is welcome and acted on.
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