Free engineering tools
that save you an hour.

Calculators, reference tables, formula cheat sheets and plain-English guides across mechanical, electrical and aerospace design. Everything runs in your browser — no sign-up, nothing to install, nothing leaves your machine.

— calculators · — references · — cheat sheets · — guides

Tools—

Engineering calculators — tolerancing, fasteners, strength, power & motion, fluids & thermal, manufacturing, electrical and aerospace.

Resources—

Reference tables and charts — tap drills, bolt torque, fits, drill & wire sizes, IP ratings, thermocouples and more.

Cheat Sheets—

Dense formula sheets by discipline — statics, fluids, GD&T, machine design, power electronics, sensors and controls.

Guides—

Plain-English explainers — GD&T, bolted joints, grounding & EMI, stress reports, sensor selection and composites.

A calculation aid, not a substitute for engineering judgment. Verify against the governing standard (ASME Y14.5, ISO 286, VDI 2230, Machinery's Handbook).