Horsepower Calculator

Horsepower, Torque & Dyno Calculator

Calculate crank vs. wheel horsepower, quarter-mile trap speed ratings, and power-to-weight ratios

Peak Torque

Torque Unit

Engine Speed (RPM)

Input Torque Measured At

Drivetrain Loss (%)

Custom Loss (%)

Flywheel Output (Crank Power)

419.6 BHP

356.7 WHP at wheels (15% drivetrain loss)

Metric Power (PS / cv) 425.4 PS DIN 70020 standard

Electrical Output 312.9 kW Kilowatt equivalent

Torque at 5,252 RPM Crossover HP = Torque Identical numerical value

Drivetrain Power Absorption 62.9 HP Lost to gear friction & heat

Total Vehicle Weight (Curb + Driver)

Weight Unit

Performance Variable to Evaluate

Trap Speed (mph)

Estimated Crank Horsepower

432.8 HP

~367.9 Wheel HP (WHP)

Theoretical 1/4-Mile ET 12.18 sec Optimal launch traction

Theoretical Trap Speed 115.0 mph 185.1 km/h at finish beams

Estimated 0–60 mph Sprint 3.9 sec Rollout excluded

Power-to-Weight Demand 8.43 lbs / HP 237.2 HP per US ton

Engine Power Rating

Power Unit

Vehicle Curb Weight

Weight Unit

Power-to-Weight Ratio

257.1 HP / Ton

7.78 lbs per HP (211.3 W/kg)

Mechanical HP (Imperial) 450.0 hp 33,000 ft-lb / min

Metric Horsepower (PS) 456.2 PS 75 kg-m / s

Electrical Power (kW) 335.6 kW Standard SI electrical power

Energy Transfer Rate 1.15M BTU/hr 247,500 ft-lb/sec work