Convert Hertz to Revolutions per minute
1 hertz is 60 rpm. One hertz is exactly 60 revolutions per minute.
One hertz is 60 revolutions per minute. To convert hertz to revolutions per minute, multiply by 60; to go the other way, divide by 60 or multiply by 0.016666667. The factor is exact rather than rounded: it follows from NIST Special Publication 811. One cycle per second.
Factor checked against the defining standard · How we check
- Hertz × 60
1 * 6060 rpm
1 hertz in every frequency unit
| Unit | Value | Exact factor |
|---|---|---|
| hertz (as entered) | 1 Hz | — |
| kilohertz | 0.001 kHz | × 0.001 |
| megahertz | 0.000001 MHz | × 0.000001 |
| gigahertz | 0.000000001 GHz | × 0.000000001 |
| terahertz | 0.000000000001 THz | × 0.000000000001 |
| revolutions per minute | 60 rpm | × 60 |
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 hertz to revolutions per minute? The converter and the working
- 1.Take the measurement in hertz.
- 2.Multiply by 60 — that is how many revolutions per minute fit in one hertz.
- 3.To go back the other way, divide by 60, or multiply by 0.016666667.
Worked example: 25 hertz to revolutions per minute
- Formula
- Hz × 60 = rpm
- Arithmetic
- 25 × 60 = 1,500 rpm
- Answer
- 25 Hz = 1,500 rpm
The factor is exact, so this figure is exact too — only the display is rounded.
Hertz to revolutions per minute conversion table
| Hertz | Revolutions per minute |
|---|---|
| 1 Hz | 60 rpm |
| 2 Hz | 120 rpm |
| 3 Hz | 180 rpm |
| 4 Hz | 240 rpm |
| 5 Hz | 300 rpm |
| 6 Hz | 360 rpm |
| 7 Hz | 420 rpm |
| 8 Hz | 480 rpm |
| 9 Hz | 540 rpm |
| 10 Hz | 600 rpm |
| 12 Hz | 720 rpm |
| 15 Hz | 900 rpm |
| 20 Hz | 1,200 rpm |
| 25 Hz | 1,500 rpm |
| 50 Hz | 3,000 rpm |
| 100 Hz | 6,000 rpm |
| 200 Hz | 12,000 rpm |
| 300 Hz | 18,000 rpm |
| 500 Hz | 30,000 rpm |
| 1000 Hz | 60,000 rpm |
| 2000 Hz | 120,000 rpm |
| 5000 Hz | 300,000 rpm |
| 10000 Hz | 600,000 rpm |
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 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.
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.
How many revolutions per minute are in a hertz?
One hertz is 60 revolutions per minute, exactly. Going the other way, one revolution per minute is 0.016666667 hertz. 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 hertz.
Source: NIST Special Publication 811 — the hertz, and SI prefixes
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- APA
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- Chicago
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Questions people actually ask
- How many revolutions per minute are in a hertz?
- 60. 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.
- How do I convert revolutions per minute back to hertz?
- Divide by 60, or multiply by 0.016666667 — they are the same operation.
Other frequency conversions
Revolutions per minute to hertz — the same conversion the other way.