Workshop Calc is a local-first iPhone and iPad toolkit for machinists, fabricators, metalworkers, CNC operators, and workshop learners.

It brings common shop calculations and references into one place: metal-weight estimates, unit and fraction conversion, tap-drill and thread data, bolt circles, chamfers and countersinks, speeds and feeds, measurement over wires, material lookup, workshop geometry, and reusable job records.

The app works offline, requires no account, contains no ads, and includes a substantial free core. An optional one-time Pro unlock adds advanced tools, unlimited history, custom shop data, and PDF, CSV, DXF, JSON, and guarded G-code exports—without a subscription.

Companion browser calculators on the YunFanLabs website let people try representative workflows before installing. Results are estimates and starting points; critical work should always be verified against standards, manufacturer data, calibrated tools, and qualified judgment.