Force Times Distance
Torque is a turning force: how hard something twists. It's calculated as force multiplied by the distance from the pivot. The SI unit is the newton-meter (Nm); the imperial unit is the pound-foot (lb-ft). One lb-ft ≈ 1.356 Nm.
Torque vs Power
Engine specs quote both torque and horsepower, and they're related but different. Torque is the twisting force; power (horsepower) is how fast that force does work. High torque gives strong low-speed pulling; high horsepower gives high top speed.
Reference
| lb-ft | Nm |
|---|---|
| 10 | 13.6 |
| 50 | 67.8 |
| 100 | 135.6 |
| 300 | 406.7 |