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Frequency
RPM to Kilohertz
Convert RPM (RPM) to kilohertz (kHz). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 RPM = 1.6667e-5 kHz
RPM to Kilohertz Conversion Table
Common values, ready to copy:
| RPM | kilohertz |
|---|---|
| 1 RPM | 1.6667e-5 kHz |
| 2 RPM | 3.3333e-5 kHz |
| 5 RPM | 8.3333e-5 kHz |
| 10 RPM | 0.000167 kHz |
| 25 RPM | 0.000417 kHz |
| 50 RPM | 0.000833 kHz |
| 100 RPM | 0.001667 kHz |
| 1,000 RPM | 0.016667 kHz |
Formula
kilohertz = RPM × 1.66666667e-5
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 Kilohertz
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).
Kilohertz (kHz): A thousand hertz; the unit for AM radio frequencies and low-frequency audio. Common uses: AM radio (530-1700 kHz), keyboard scan rates, and the upper end of human audible frequencies.
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 kilohertz = RPM × 1.66666667e-5, 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 kilohertz 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.