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Torque Converter
Convert N·m, lb·ft, lb·in, kgf·cm and oz·in — and get power from rpm.
Result
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Quick Tool Overview
The Torque Converter translates newton metres, pound-feet, pound-inches, kilogram-force centimetres, ounce-inches and more, and — given a speed in rpm — works out the power the torque delivers in kW and horsepower.
- What it does
- Converts torque between 12 units
- You give it
- A torque value, its unit and optionally rpm
- You get back
- The converted torque, a unit table and power
- Best for
- Workshop manuals, bolt specs, motors and servos
About the Torque Converter
Torque specifications arrive in whatever unit the manufacturer grew up with. A car workshop manual says pound-feet, a European bike part says newton metres, a small servo is rated in kilogram-force centimetres and a torque screwdriver in ounce-inches or pound-inches.
Enter the value and its unit and the converter gives you the unit you need, the one-unit factors in both directions, and the same torque in every other unit. Add an engine or motor speed and it also works out the power that torque delivers, in kilowatts, mechanical horsepower and metric PS — the relationship behind every dyno chart.
Key features of the Torque Converter
Automotive and hobby units
lb·ft and N·m for engines and wheel nuts, kgf·cm and oz·in for servos and small motors.
Power from torque
Enter rpm to get kilowatts, mechanical horsepower and metric PS from P = T × 2π × rpm ÷ 60.
Factors both ways
The one-unit factor is shown in each direction, which is what you need to check a spec sheet by hand.
Full unit table
Every torque unit is listed at once, with click-to-copy values.
Exact definitions
Imperial units are derived from the defined pound-force and inch, so conversions are exact rather than rounded.
How to use the Torque Converter
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1
Enter the torque
Type the value from the spec sheet or wrench setting.
-
2
Choose the units
Pick the unit you have and the unit you need, or tap a preset such as lb·ft to N·m.
-
3
Add a speed if you want power
Enter rpm to see the power that torque produces at that speed.
-
4
Copy any value
The table below lists every unit; click a value to copy it.
Frequently asked questions
Multiply by 1.3558179483. So 100 lb·ft is 135.58 N·m. Going the other way, divide newton metres by the same number.
For torque they are used interchangeably. Strictly, pound-foot is the torque unit and foot-pound the unit of energy, but both have the same dimensions and the same value.
Power in watts equals torque in newton metres multiplied by the angular speed in radians per second, which is rpm × 2π ÷ 60.
Mostly for small motors and hobby servos. One kgf·cm is 0.0980665 N·m, so a 10 kgf·cm servo delivers about 0.98 N·m.
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