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GEARLINE TOOLS / 03

Power meets weight.

Compare two setups. Keep the units and measurement basis clear.

GEARLINE TOOL GUIDE

How to compare power-to-weight

Compare two setups using the same power measurement method and the same definition of vehicle weight.

  1. 01

    Choose the weight unit

    Select pounds or kilograms. Changing the unit converts both entered weights automatically.

  2. 02

    Choose the power basis

    Label both setups as engine horsepower or wheel horsepower. The calculator does not convert between them.

  3. 03

    Enter comparable setups

    Use figures measured on the same basis, with comparable fuel loads and vehicle-weight definitions.

READING THE RESULT

Higher hp per unit of weight means more power for the same mass. Lower lb/hp means less weight for each horsepower. The headline shows Setup B’s percentage change relative to Setup A.

WHAT IT DOES NOT DO

Power-to-weight alone does not predict acceleration, grip, braking, lap time, or overall vehicle quality. Mechanical horsepower is different from metric PS and kilowatts.

Compare two setups

Illustrative starting values. Enter matching measurements for your own setups.

Setup A
Setup B

Changing the weight unit converts the entered values. Engine/wheel is a label for both setups; it does not estimate drivetrain losses.

Power, with perspective.

+10%Setup B power-to-weight change relative to A
Setup A157.5 hp / metric tonne
Setup B173.2 hp / metric tonne
Engine horsepower basis
RatioSetup ASetup B
hp / lb0.07140.0786
lb / hp1412.73
hp / kg0.15750.1732
hp / metric tonne157.5173.2
hp / US short ton142.9157.1

Higher hp per unit of weight is better for this ratio. Lower lb/hp means less weight per horsepower.

Same basis. Meaningful comparison.

Power-to-weight is horsepower divided by weight. A metric tonne is 1,000 kg; a US short ton is 2,000 lb. One pound is 0.45359237 kg. This calculator expects mechanical horsepower, not metric PS or kilowatts.

Use comparable weight definitions, fuel loads, and power measurement methods. This ratio does not predict acceleration, grip, lap times, or a car’s overall quality.

Understand the ratio