Workshop unit converter
Half the spec sheets in a tyre bay are metric, the other half came off an American forum. Length, mass and speed — the everyday conversions, without a calculator app and a sticky note.
Converter
Pick a measurement type, enter a value and its unit.
Working in pressure? Use the dedicated kPa ↔ bar ↔ psi converter — it also covers kg/cm².
The conversions worth memorising
1 inch = 25.4 mm exactly — a 205 section width is a shade over 8 inches. 1 kg = 2.205 lbs, so that 1 450 kg load index is roughly 3 200 lbs. 100 km/h = 62 mph; the 120 km/h national limit is about 75 mph.
Pressure has its own tool because it's the one everyone actually fights over: kPa ↔ bar ↔ psi ↔ kg/cm². Also in the toolkit: the load index chart and speed rating table.