Convert Revolutions per minute to Hertz
1 revolution per minute is 0.02 Hz. One revolution per minute is exactly 0.0166666666667 hertz.
One revolution per minute is 0.016666667 hertz. To convert revolutions per minute to hertz, multiply by 0.016666667; to go the other way, divide by 0.016666667 or multiply by 60. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Special Publication 811. One turn a minute, so 60 rpm is 1 Hz.
Factor checked against the defining standard · How we check
- Revolutions per minute × 0.016666667
1 * 0.01666670.017 Hz
1 revolution per minute in every frequency unit
| Unit | Value | Exact factor |
|---|---|---|
| hertz | 0.01666666667 Hz | × 0.0166666666667 |
| kilohertz | 0.00001666666667 kHz | × 0.0000166666666667 |
| megahertz | 0.00000001666666667 MHz | × 0.0000000166666666667 |
| gigahertz | 0.00000000001666666667 GHz | × 0.0000000000166666666667 |
| terahertz | 0 THz | × 0.0000000000000166666666667 |
| revolutions per minute (as entered) | 1 rpm | — |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert revolutions per minute to hertz? The converter and the working
- 1.Take the measurement in revolutions per minute.
- 2.Multiply by 0.016666667 — that is how many hertz fit in one revolution per minute.
- 3.To go back the other way, divide by 0.016666667, or multiply by 60.
Worked example: 25 revolutions per minute to hertz
- Formula
- rpm × 0.016666667 = Hz
- Arithmetic
- 25 × 0.016666667 = 0.42 Hz
- Answer
- 25 rpm = 0.42 Hz
The factor is rounded for display; the figure above is computed from the full value.
Revolutions per minute to hertz conversion table
| Revolutions per minute | Hertz |
|---|---|
| 1 rpm | 0.02 Hz |
| 2 rpm | 0.03 Hz |
| 3 rpm | 0.05 Hz |
| 4 rpm | 0.07 Hz |
| 5 rpm | 0.08 Hz |
| 6 rpm | 0.1 Hz |
| 7 rpm | 0.12 Hz |
| 8 rpm | 0.13 Hz |
| 9 rpm | 0.15 Hz |
| 10 rpm | 0.17 Hz |
| 12 rpm | 0.2 Hz |
| 15 rpm | 0.25 Hz |
| 20 rpm | 0.33 Hz |
| 25 rpm | 0.42 Hz |
| 50 rpm | 0.83 Hz |
| 100 rpm | 1.67 Hz |
| 200 rpm | 3.33 Hz |
| 300 rpm | 5 Hz |
| 500 rpm | 8.33 Hz |
| 1000 rpm | 16.67 Hz |
| 2000 rpm | 33.33 Hz |
| 5000 rpm | 83.33 Hz |
| 10000 rpm | 166.67 Hz |
Sixty rpm is one hertz
Both count the same thing at different rates: revolutions per minute against cycles per second. A 7,200 rpm hard drive spins at 120 Hz, a 3,000 rpm engine turns at 50 Hz, and a mains motor on a 50 Hz supply runs near 3,000 rpm for exactly that reason — the two numbers are the same fact divided by sixty.
NIST Special Publication 811 — Guide for the Use of the International System of Units
What is a revolution per minute?
One turn a minute, so 60 rpm is 1 Hz. Engines, drills and hard drives are all rated in it: a 7,200 rpm drive spins at 120 Hz.
What is a hertz?
One cycle per second. The SI unit is defined as a reciprocal second, which is why it is used for periodic events and never for a rate of something that is not periodic.
How many hertz are in a revolution per minute?
One revolution per minute is 0.016666667 hertz. Going the other way, one hertz is 60 revolutions per minute. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every frequency unit here
The whole group — 6 units with their symbols and the size of each one in hertzs — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a revolution per minute.
Source: NIST Special Publication 811 — the hertz, and SI prefixes
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Questions people actually ask
- How many hertz are in a revolution per minute?
- 0.016666667. One cycle per second. The SI unit is defined as a reciprocal second, which is why it is used for periodic events and never for a rate of something that is not periodic.
- How do I convert hertz back to revolutions per minute?
- Divide by 0.016666667, or multiply by 60 — they are the same operation.
Other frequency conversions
Hertz to revolutions per minute — the same conversion the other way.