RPM to Hertz
Convert revolutions per minute to hertz and back. Motors, fans and drills are specified in rpm, while vibration analysis and variable-frequency drives are set in hertz.
Common values
Formula
Hz = rpm × 0.016666666666666666
Supply frequency and shaft speed are not the same thing. A four-pole motor on 60 Hz turns at a synchronous 1,800 rpm — 120 × frequency ÷ poles. For angular velocity in rad/s, multiply the hertz here by 2π.
Frequently asked questions
Q. How many Hz is 1 rpm?
1 rpm is 0.0167 Hz, and 10 rpm is 0.1667 Hz. Type any value in the box above to convert instantly.
Q. And how many rpm is 1 Hz?
1 Hz is 60 rpm. This converter works both ways, so typing in the right box updates the left one.
Q. Where is this unit used?
Supply frequency and shaft speed are not the same thing. A four-pole motor on 60 Hz turns at a synchronous 1,800 rpm — 120 × frequency ÷ poles. For angular velocity in rad/s, multiply the hertz here by 2π.
Other converters
Traditional units (geun, doe, majigi and so on) vary by region and product.