Power-to-Weight Ratio Calculator
Calculate power-to-weight ratio in hp/lb, hp/ton, and kW/kg from engine power and vehicle weight.
Power-to-Weight Ratio Mathematics
Power-to-weight ratio calculator computes hp per pound, hp per ton, and kW per kg from engine power and vehicle weight.
Power-to-weight ratio measures how much power is available per unit of mass — a core determinant of acceleration performance in vehicles, engines, and even athletes. A higher ratio generally means quicker acceleration.
- 1Enter the power in horsepower and the weight in pounds.
- 2View the power-to-weight ratio in hp/lb, hp/ton, and kW/kg.
A car produces 300 horsepower and weighs 3,500 pounds.
Frequently Asked Questions (FAQ)
Economy cars typically run 60-100 hp/ton, sports cars 150-250 hp/ton, and supercars can exceed 400-500 hp/ton — higher generally means faster acceleration.
It's also used for aircraft (thrust-to-weight for climb rate), cycling (watts per kg for climbing performance), and general engineering to compare the efficiency of different power sources relative to their mass.
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