Torque Power RPM Calculator

Inputs

Solve for

Choose the unknown variable.

Torque (T)

Shaft torque.

N·m

Speed (n)

Shaft speed in revolutions per minute.

rpm

Default result

Power(P)

15.708kW

Pass

Solved from torque and RPM.

P = T*(2*pi*n/60).

Also computed

Torque(T)100N·m

T = P/omega.

Speed(n)1,500rpm

n = omega*60/(2*pi).

Method notes 2 notes

Uses P = T*omega with omega = 2*pi*n/60. In practical metric form, P(kW) = T(N*m)*n(rpm)/9549.2966.
This is steady shaft power. Add drivetrain efficiency, service factor, startup torque, thermal rating and duty cycle for real motor or gearbox sizing.