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Shaft Power & Torque Calculator

HP ↔ kW ↔ Torque (ft-lb / N·m) ↔ RPM

When to use: Use to convert between shaft power and torque units for motors, pumps, fans, compressors, and rotating machinery. The fundamental relationship is Power = Torque × Angular Velocity. In US units: HP = Torque (ft-lb) × RPM / 5252. Useful for motor selection, belt drive sizing, coupling selection, and verifying nameplate data.

Inputs
HP
Motor/shaft speed
RPM
Common Motor Speeds
2-pole, 60 Hz
4-pole, 60 Hz
6-pole, 60 Hz
8-pole, 60 Hz
Torque
30.01
ft-lb
Conversions
Power (HP)10.000 HP
Power (kW)7.457 kW
Power (Watts)7457.0 W
Torque (ft-lb)30.01 ft·lb
Torque (in-lb)360.1 in·lb
Torque (N·m)40.69 N·m
Angular Velocity183.26 rad/s
References
HP = T(ft-lb) × RPM / 5252
kW = HP × 0.7457
1 ft-lb = 1.35582 N·m
ω (rad/s) = RPM × 2π / 60