Hertz (Hz) to RPM Converter
Enter a value to instantly convert between frequency units.
1 Hertz = 60 RPM
Key Formulas
Hertz → Kilohertz
kHz = Hz × 0.001Kilohertz → Hertz
Hz = kHz × 1000Megahertz → Gigahertz
GHz = MHz × 0.001Gigahertz → Megahertz
MHz = GHz × 1000Formula
RPM = Hz × 60Motor controllers, vibration analyzers, and AC drive inverters express rotation frequency in Hz — cycles per second. But mechanics, engine specs, and HVAC equipment rate speed in RPM — rotations per minute. The conversion is direct: one full rotation per second equals 60 rotations per minute. A motor running at 50 Hz completes 3,000 RPM. Converting Hz to RPM lets you match inverter output settings to mechanical speed requirements on equipment nameplates.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A 2-pole AC induction motor on 50 Hz mains runs at synchronous speed of 3,000 RPM. This is the standard in 50 Hz countries (Europe, Asia, Africa).
50 Hz = 3000 rpm
A 2-pole AC motor on 60 Hz mains runs at 3,600 RPM synchronous speed. Standard in North America. Actual speed is slightly less due to slip.
60 Hz = 3600 rpm
Typical engine idle speed. An engine idling at 800 RPM corresponds to 13.33 Hz — 13.33 complete crankshaft rotations per second.
13.33 Hz = 800 rpm
Hard drive platter speed. A 7,200 RPM hard drive spins at exactly 120 Hz — 120 complete rotations per second of its read/write platters.
120 Hz = 7200 rpm