Engineering calculators

Free engineering
calculators

Quick, standards-based calculators for everyday mechanical design work. They run in your browser: no sign-up and nothing to install.

Pick hole and shaft classes from button grids to see deviations, clearance or interference and the fit type, with a tolerance zone diagram.

Parallel key size, shaft and hub keyway depths and width tolerances for any shaft up to 500 mm, with dimensioned sections.

Coming soon

DIN 5480

Involute spline geometry and inspection dimensions for shaft and hub connections.

In development

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