Torque Calculator
Calculate torque using T = Force × Lever Arm (T = F × r), or use the unit converter to switch between any torque units including N·m, lbf·ft, kgf·m, and more.
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Torque Formula
Torque is also called the moment of force. It represents the rotational tendency produced by a force applied at a perpendicular distance from a pivot point. The SI unit is the Newton metre (N·m).
Frequently Asked Questions
Torque (also called moment of force) is the rotational equivalent of linear force. It measures how much a force tends to rotate an object about an axis or pivot. The formula is T = F × r, where F is the force applied perpendicular to the lever arm and r is the distance from the pivot (radius). The SI unit is the Newton metre (N·m).
Torque is a static or instantaneous twisting force (N·m), while power is the rate of doing work over time (Watts). They are related by the equation: Power (W) = Torque (N·m) × Angular velocity (rad/s). An engine can produce high torque at low RPM but low power, or low torque at high RPM with high power.
Multiply N·m by 0.737562 to get lbf·ft. For example, 100 N·m × 0.737562 = 73.76 lbf·ft. To convert lbf·ft to N·m, multiply by 1.35582.
Torque is measured using a torque wrench (which clicks at a set value) or a torque sensor/transducer. In engines, a dynamometer measures torque on a rotating shaft. Digital torque wrenches provide direct readouts in N·m, lbf·ft, or kgf·m.
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