Horsepower Comparison Calculator
Compare two vehicles by horsepower, weight and power-to-weight ratio.
Raw horsepower alone doesn't decide which car is quicker — weight matters just as much. This tool compares two vehicles by power-to-weight ratio, the truest single measure of performance potential.
How the Comparison Works
A 300 HP car at 3,200 lb (0.094 hp/lb) actually out-accelerates a 400 HP car at 4,400 lb (0.091 hp/lb), despite having 100 fewer horsepower — because it carries less weight per horsepower.
How to Use This Calculator
- Enter Car 1's horsepower and weight.
- Enter Car 2's horsepower and weight.
- See which has the better power-to-weight ratio.
Worked Example
Frequently Asked Questions
Compare their power-to-weight ratios (horsepower ÷ weight), not just raw horsepower. The higher ratio indicates better acceleration potential.
Yes. If it's light enough, a lower-horsepower car can have a better power-to-weight ratio and out-accelerate a more powerful but heavier car.
Use the same basis for both cars. Wheel horsepower is most realistic, but as long as both figures are measured the same way, the comparison is fair.
No. It predicts potential, but real-world results also depend on traction, gearing, aerodynamics, and transmission type.
Around 0.05 hp/lb is an economy car, 0.1 hp/lb is a quick sports car, and supercars exceed 0.2 hp/lb.