ELECTRICAL / CALCULATOR

Motor Torque

Calculate steady-state shaft torque from output power and speed.

Input Parameters

Edit the example values. Results update as you type.

Shaft Output Power P

Speed n

T = P / ω ≈ 9550 × P(kW) / n(rpm)

T = 15,000 / (2π × 1,450 / 60) = 98.786 N·m

Convert power to 15,000 W.
Convert speed to angular velocity 151.844 rad/s, then divide power by angular velocity.

Use steady-state shaft power and actual speed at the operating point. The calculation uses the exact P / ω relation.

T = P / ω ≈ 9550 × P(kW) / n(rpm)

Can this formula calculate stall torque at zero speed?

Speed must be greater than zero. Obtain stall torque from the manufacturer's characteristic curves.