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Enter the power of your engine and the total weight of your vehicle to calculate the power-to-weight ratio (PWR)
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Use this Power-to-Weight Ratio (PWR) Calculator to evaluate the true performance potential of your vehicle, machine, or even yourself as a cyclist. This tool helps you compare power output (the ability to do work) relative to weight (mass), giving meaningful insight into acceleration and efficiency.
The power-to-weight ratio (PWR) measures how much power a system produces compared to its weight. It is widely used in automotive engineering, motorsports, aviation, robotics, and athletics.
Formula:
PWR = Power / Weight
Generally, a higher power-to-weight ratio means:
For example, if two cars have identical horsepower but different weights, the lighter car will have a higher PWR and better acceleration potential.
Important Note: While PWR is a key performance indicator, real-world results also depend on aerodynamics, drivetrain efficiency, traction, torque curves, and rolling resistance.
Identify the power output of the system. Common units include:
Measure the weight of the system using:
For vehicles, use curb weight (vehicle weight without passengers or cargo).
PWR = Power / Weight
The result is typically expressed as:
A car weighs 3,000 lb and produces 350 hp.
PWR = 350 / 3000
PWR ≈ 0.1167 hp/lb
This indicates moderate-to-strong performance for a street vehicle.
A cyclist weighs 60 kg and sustains 210 W.
PWR = 210 / 60
PWR = 3.5 W/kg
A value of 3.5 W/kg represents strong amateur cycling performance.
The chart below shows W/kg values for different rider weights and power outputs.
| Weight | 120W | 150W | 180W | 210W | 240W | 270W | 300W | 330W | 360W | 390W |
|---|---|---|---|---|---|---|---|---|---|---|
| 45kg | 2.7 | 3.3 | 4.0 | 4.7 | 5.3 | 6.0 | 6.7 | 7.3 | 8.0 | 8.7 |
| 50kg | 2.4 | 3.0 | 3.6 | 4.2 | 4.8 | 5.4 | 6.0 | 6.6 | 7.2 | 7.8 |
| 55kg | 2.2 | 2.7 | 3.3 | 3.8 | 4.4 | 4.9 | 5.4 | 6.0 | 6.5 | 7.1 |
| 60kg | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | 6.0 | 6.5 |
| 65kg | 1.8 | 2.3 | 2.8 | 3.2 | 3.7 | 4.1 | 4.6 | 5.0 | 5.5 | 6.0 |
| 70kg | 1.7 | 2.1 | 2.6 | 3.0 | 3.4 | 3.8 | 4.3 | 4.7 | 5.1 | 5.6 |
| 75kg | 1.6 | 2.0 | 2.4 | 2.8 | 3.2 | 3.6 | 4.0 | 4.4 | 4.8 | 5.2 |
| 80kg | 1.5 | 1.9 | 2.2 | 2.6 | 3.0 | 3.4 | 3.8 | 4.1 | 4.5 | 4.9 |
| 85kg | 1.4 | 1.8 | 2.1 | 2.5 | 2.8 | 3.2 | 3.5 | 3.9 | 4.2 | 4.6 |
| 90kg | 1.3 | 1.7 | 2.0 | 2.3 | 2.7 | 3.0 | 3.3 | 3.7 | 4.0 | 4.3 |
| 95kg | 1.2 | 1.5 | 1.9 | 2.2 | 2.5 | 2.8 | 3.2 | 3.5 | 3.8 | 4.1 |
Permanent magnet motors typically offer very high power-to-weight ratios due to strong magnetic fields, compact design, and lightweight construction. However, the best motor depends on its intended application.
Power-to-weight ratio strongly influences acceleration potential. However, traction, torque curve, gearing, aerodynamics, and mechanical efficiency also affect real-world performance.
From Wikipedia: Power-to-weight ratio – Physical interpretation and propulsive power.
From JTech.org: Calculating Power-to-Weight Ratio – Performance applications.
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