RPM ↔ Frequency Converter
Convert
Relate rotational speed (RPM) to electrical frequency (Hz) and angular velocity (rad/s).
RPM (revolutions per minute) is a measure of rotational speed. It relates to frequency (cycles per second) by f = RPM/60, and to angular velocity (rad/s) by ω = 2π·f.
Converting RPM to Hz matters when relating a motor's shaft speed to its electrical frequency (e.g. a 3600 RPM single-pole motor produces 60 Hz), or when reading a tachometer in RPM and comparing it to a signal generator in Hz.
Common applications
Relating a motor's RPM to its electrical frequency; reading a tachometer in RPM; converting a spindle's speed to Hz for a VFD.
Frequently asked questions
f (Hz) = RPM / 60. For example, 3600 RPM = 60 Hz.
ω (rad/s) = 2π·f. It's the rotational speed in radians per second.
Yes — for an AC machine, electrical frequency = (RPM × poles) / 120. This converter assumes one electrical cycle per revolution.