Apps
Free online car tools and calculators for DIY mechanics and owners. Fuel cost, engine, tire, maintenance, diagnostics, and conversion apps — instant, no signup.
Speedometer Error Calculator – Tire Size Change
Speedometer Error Calculator See exactly how a tire size change affects your indicated vs actual speed — and whether you’re unknowingly speeding. Speedometer Error Calculator....
Tire Life Calculator – Estimate Remaining Tread Miles
Tire Life Calculator Estimate how many kilometres are left on your tyres from current tread depth — plan your next purchase before the legal limit.....
Tire Pressure Calculator – Adjust for Load & Towing
Tire Pressure Load Adjustment Get a guideline tire pressure adjustment for heavy loads — enter your placard pressure, baseline load, and current load. Tyre Pressure....
Tire Size Calculator – Diameter, Width & Sidewall
Tire Size Calculator Enter any tire code — 205/55R16, 275/35R20 — and instantly get width, sidewall height, overall diameter, and circumference. Tyre Size Calculator Enter....
Tire Size Comparison – Compare Two Tire Sizes
Tire Size Comparison Compare two tire sizes side-by-side — see diameter difference, speedometer error, and ground clearance change. Tire Size Comparison Tool Two codes →....
Turbo Boost Calculator – Estimate Power Gain from PSI
Turbo Boost Power Calculator Estimate horsepower gain from boost pressure relative to atmospheric — quick turbo planning and intercooler sizing guide. Boost Power Estimator NA....
Wheel Offset Calculator – ET, Backspacing & Poke
Wheel Offset Calculator Convert between ET offset, backspacing, and poke — check wheel fitment before buying new rims. Wheel Offset Converter ET ↔ Backspacing ↔....
