How to use
- Type a torque value, such as a wrench setting or an engine’s rated torque.
- Pick From and To: N·m, lb-ft, lb-in, oz-in, kgf·m or kgf·cm.
- Read the answer, with the exact factor below it.
How the conversion works
Every unit is converted through the newton meter (N·m), the SI unit of torque:
| Unit | In N·m |
|---|---|
| 1 pound-foot (lbf·ft, ft-lb) | 1.3558179 |
| 1 pound-inch (lbf·in, in-lb) | 0.11298483 |
| 1 ounce-inch (ozf·in) | 0.0070615518 |
| 1 kilogram-force meter (kgf·m) | 9.80665 |
| 1 kilogram-force centimeter (kgf·cm) | 0.0980665 |
| 1 kilonewton meter (kN·m) | 1,000 |
The pound-force units are built from the exact pound (0.45359237 kg), standard gravity (9.80665 m/s²) and the exact foot and inch. So every factor is exact before the answer is rounded.
Examples
- 100 N·m: 100 × 0.73756 = 73.76 lb-ft
- 80 lb-ft: 80 × 1.35582 = 108.5 N·m
- 25 lb-ft: 25 × 12 = 300 lb-in
- A 20 kgf·cm servo: 20 × 0.0980665 = 1.96 N·m
Torque conversion charts
| N·m | lb-ft | lb-in |
|---|---|---|
| 10 | 7.4 | 89 |
| 25 | 18.4 | 221 |
| 50 | 36.9 | 443 |
| 80 | 59 | 708 |
| 100 | 73.8 | 885 |
| 150 | 110.6 | 1,328 |
| 200 | 147.5 | 1,770 |
| 300 | 221.3 | 2,655 |
| lb-ft | N·m |
|---|---|
| 10 | 13.6 |
| 25 | 33.9 |
| 50 | 67.8 |
| 80 | 108.5 |
| 100 | 135.6 |
| 150 | 203.4 |
| 200 | 271.2 |
More detail: lb-ft or ft-lb, and why not joules?
- NIST lists the pound-force foot (lbf·ft) for torque and the foot pound-force (ft·lbf) for work and energy. Both equal 1.355818 in SI units.
- Torque wrenches and manuals often say ft-lb for torque. Here it means the same as lb-ft.
- The SI uses the newton meter for torque and keeps the joule for energy, even though both are a newton times a meter.
Working with a straight push or pull instead? Use the force converter.