Convert dyno (wheel) power to crank power and back, using typical drivetrain losses.
Type the power and say whether it is a wheel (dyno) figure or a crank/flywheel claim.
FWD ≈ 11%, RWD ≈ 15%, AWD ≈ 20% typical losses — or set a custom value.
See the matching wheel and crank power side by side, plus the loss in HP.
Power is lost through the gearbox, clutch/torque converter, driveshafts and final drive between the crank and the wheels. Wheel HP = crank HP × (1 − loss).
Rules of thumb: FWD around 10–12%, RWD around 15%, AWD around 20–25%. Manuals usually lose less than autos. They are estimates — a hub dyno is the only exact measure.
Brochures quote crank power; a rolling-road dyno measures wheel power, which is always lower by the drivetrain loss.
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