Speedmaster Tools
Precision automotive performance calculators. Whether you're optimizing engine specs, dialling in gear ratios, or chasing quarter-mile times — select a calculator from the menu or choose a category below.
Engine / Performance
Bore size, compression ratio, carburetor sizing, fuel injector flow, horsepower from airflow and forced induction.
10 CalculatorsRear Gear
Gear ratio requirements, speed from RPM, and RPM from speed with rear and transmission gear ratios.
3 CalculatorsDrag Strip
Quarter and eighth mile ET, MPH, and horsepower calculations. Predict performance from 60ft times.
9 Calculators