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Frequency
RPM to Hertz
Convert RPM (RPM) to hertz (Hz). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 RPM = 0.016667 Hz
RPM to Hertz Conversion Table
Common values, ready to copy:
| RPM | hertz |
|---|---|
| 1 RPM | 0.016667 Hz |
| 2 RPM | 0.033333 Hz |
| 5 RPM | 0.083333 Hz |
| 10 RPM | 0.166667 Hz |
| 25 RPM | 0.416667 Hz |
| 50 RPM | 0.833333 Hz |
| 100 RPM | 1.6667 Hz |
| 1,000 RPM | 16.6667 Hz |
Formula
hertz = RPM × 1.66666667e-2
Frequency uses the SI hertz (Hz, cycles per second). 1 kHz = 1,000 Hz; 1 MHz = 1 million Hz; 1 GHz = 1 billion Hz. RPM and BPM are both "cycles per minute": 60 RPM = 1 Hz.
About RPM and Hertz
RPM (RPM): Revolutions per minute; a practical unit for rotating machinery, equal to 1/60 Hz when reinterpreted as cycles per second. Common uses: Engine speed (idle ≈ 600-800 RPM, redline 6,000-8,000 RPM in cars), hard drive speeds (5,400 or 7,200 RPM), kitchen mixers, and turntable speeds (33⅓ or 45 RPM).
Hertz (Hz): Cycles per second; named for Heinrich Hertz, who experimentally demonstrated electromagnetic waves in 1887. Common uses: Audio (Hz range for human hearing is 20-20,000 Hz), AC power frequency (50 or 60 Hz), and the SI base unit for any periodic phenomenon.
How the conversion works
Frequency uses the SI hertz (Hz, cycles per second). 1 kHz = 1,000 Hz; 1 MHz = 1 million Hz; 1 GHz = 1 billion Hz. RPM and BPM are both "cycles per minute": 60 RPM = 1 Hz.
The exact relationship is hertz = RPM × 1.66666667e-2, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between RPM and hertz comes up wherever frequency measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.