Convert RPM to Kilohertz
RPM to kilohertz is the conversion you need when a rotation speed — an engine, a motor, a hard drive, a turntable — has to sit next to frequencies measured in kilohertz. The clean way is to divide the RPM by 60 to get hertz, then by another 1000 for kilohertz. Written as a single multiplier, 1 RPM is about 0.0000166667 kHz, a rounded repeating decimal.
Revolutions per minute to Kilohertz conversion table
| Revolutions per minute (rpm) | Kilohertz (kHz) |
|---|---|
| 1 | 0.0000166667 |
| 2 | 0.0000333333 |
| 3 | 0.00005 |
| 5 | 0.0000833333 |
| 10 | 0.000167 |
| 20 | 0.000333 |
| 50 | 0.000833 |
| 100 | 0.001667 |
| 500 | 0.008333 |
| 1,000 | 0.016667 |
The formula
To convert RPM to kilohertz, divide the revolutions per minute by 60 to get hertz, then by 1000:
kilohertz = RPM ÷ 60 ÷ 1000
Written as a single multiplier, 1 RPM is about 0.0000166667 kHz, but dividing by 60 is the clean way to do it.
A worked example
Say something spins at 60,000 RPM and you want that in kilohertz:
60,000 ÷ 60 = 1000 Hz = 1 kHz
So 60,000 RPM is exactly 1 kHz.
Why it's an approximation
The clean part is the division: RPM ÷ 60 gives hertz, and ÷ 1000 gives kilohertz. Because there are exactly 60 seconds in a minute, a round RPM value like 60,000 gives an exact answer — 1 kHz. The approximation only shows up when you write the rule as a single multiply-factor. One RPM is 1/60 of a hertz, and 1/60 as a decimal is 0.016666… repeating without end, so once you scale it down to kilohertz the multiplier 0.0000166667 is rounded. Stick to dividing by 60 and then 1000 and you keep the exact result.
When you'll use it
Placing a rotation speed alongside frequencies already quoted in kilohertz, and comparing motor or drive speeds against signal or clock rates measured in kHz.
Frequently asked questions
How do I convert RPM to kilohertz?
Divide the RPM by 60 to get hertz, then divide by 1000 to reach kilohertz. So 60,000 RPM ÷ 60 = 1000 Hz, which is 1 kHz.
How many kilohertz is 60,000 RPM?
Exactly 1 kHz. Dividing 60,000 by 60 gives 1000 Hz, and 1000 Hz is 1 kHz — a clean result because the RPM value is a round multiple of 60.
Is 1 RPM equal to 0.0000166667 kilohertz?
Roughly. One RPM is 1/60 of a hertz, and a hertz is 1/1000 of a kilohertz, so 1 RPM works out to about 0.0000166667 kHz — a rounded figure, since the underlying 1/60 is a repeating decimal.