Automotive Engineering Tools
Powertrain calculators for engine displacement, horsepower-to-torque conversion, tyre diameter, and braking distances.
Free online general tools.
Brake Distance Calculator
Calculate vehicle theoretical stopping distance based on road speed, tyre friction coefficient (dry/wet/ice), and driver reaction time.
Engine Compression Calculator
Calculate static compression ratio (CR) from cylinder volume, combustion chamber cc, head gasket thickness, and piston dome/dish.
Engine Displacement Calculator
Calculate internal combustion engine displacement (cc and cubic inches) from cylinder bore, piston stroke, and cylinder count.
Fuel Economy Calculator
Convert and calculate vehicle fuel efficiency across MPG (US/UK), Liters per 100km (L/100km), and km/L.
Gear Ratio Calculator
Calculate transmission gear ratios, final drive axle ratio, and resulting vehicle road speed in each gear.
Horsepower Calculator
Calculate brake horsepower (BHP) from engine flywheel torque (lb-ft) and RPM (HP = Torque ร RPM / 5252).
Speedometer Error Calculator
Calculate speedometer percentage error and true road speed variance after changing wheel or tyre sizes.
Torque-to-Power Calculator
Convert between rotational engine torque (lb-ft, Nm) and mechanical power (HP, kW) at specified engine revs.
Tyre Diameter Calculator
Calculate total tyre outer diameter, sidewall height, circumference, and revolutions per mile from tyre spec codes (e.g. 225/45R17).
Vehicle Power-to-Weight Calculator
Calculate power-to-weight ratios (HP per ton, W/kg) and estimate 0-60 mph acceleration potential.