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Vehicle, Cycling, and Performance Ratio Tool

Power-to-Weight Ratio Calculator

Calculate HP per pound, HP per 1,000 lb, lb per HP, kW per tonne, and W/kg. Use it for cars, motorcycles, cycling, lightweight builds, and performance comparisons.

HP/lb, HP/ton, lb/HP, and W/kg

Calculate Power-to-Weight Ratio

Enter power and weight to compare cars, motorcycles, cyclists, and builds. Switch modes for A/B comparison or target-ratio planning.

hp
Power slider
01500 hp
lb
Weight slider
18000 lb
lb
Weight Removed slider
01000 lb
Formula: power-to-weight ratio = power / weight. Automotive users often read it as HP per 1,000 lb or lb per HP; cyclists often use W/kg.

Power-to-Weight Ratio Formula

Power-to-weight ratio equals power divided by weight. Automotive readers often compare HP per 1,000 lb or lb per HP, while cycling and endurance sports usually use W/kg.

Use Race Weight When Possible

For real vehicle comparison, use race weight or curb weight plus driver and fuel. Manufacturer curb weight and advertised horsepower can make two cars look closer than they feel on the road.

Weight Loss vs Horsepower Gain

Reducing weight improves the ratio without changing engine output. The calculator estimates how much extra horsepower would be needed to match the same ratio improvement at the original weight.

What the Ratio Does Not Include

Power-to-weight is useful, but it does not fully predict 0-60 mph or lap times. Traction, gearing, torque curve, aero drag, tires, drivetrain loss, and launch control still matter.

Car Power-to-Weight Benchmarks

Range
Ratio
Typical Use
Economy Range
Under 50 HP per 1,000 lb
Daily economy cars and heavier low-power vehicles.
Mainstream Range
50-90 HP per 1,000 lb
Typical commuting cars, crossovers, and light trucks.
Sporty Range
90-130 HP per 1,000 lb
Warm hatches, lighter coupes, and stronger daily drivers.
Performance Range
130-180 HP per 1,000 lb
Sports cars, muscle cars, and track-focused builds.
Supercar Range
180-260 HP per 1,000 lb
Very fast street cars and many supercars.
Extreme Range
260+ HP per 1,000 lb
Dedicated drag, race, hypercar, or unusually light high-power builds.

Frequently Asked Questions

How do I calculate power-to-weight ratio?+

Divide power by weight. Cars often use horsepower per pound, horsepower per 1,000 pounds, or pounds per horsepower. Cycling commonly uses watts per kilogram.

What is a good power-to-weight ratio for a car?+

A higher ratio is generally better. Economy cars are usually low, sporty cars are higher, and supercars can exceed 180 horsepower per 1,000 pounds.

Is HP per pound better than lb per HP?+

They describe the same relationship in opposite directions. Higher HP per pound is better, while lower pounds per horsepower is better.

How much horsepower is 100 pounds worth?+

It depends on the current power and weight. Removing 100 pounds increases the ratio, and the calculator estimates the horsepower gain needed to match that ratio.