Convert Revolutions per minute to Hertz (rotational)
Instantly convert Revolutions per minute (RPM) to Hertz (rotational) (Hz) with our free online calculator.
Formula: RPM to Hz — multiply by 0.0166667
Reference Table
| Revolutions per minute (RPM) | Hertz (rotational) (Hz) |
|---|---|
| 1 | 0.0166667 |
| 5 | 0.0833333 |
| 10 | 0.166667 |
| 25 | 0.416667 |
| 50 | 0.833333 |
| 100 | 1.66667 |
How to Convert Revolutions per minute to Hertz (rotational)
Formula
To convert Revolutions per minute (RPM) to Hertz (rotational) (Hz): multiply by 0.0166667
Step-by-Step
- Start with your value in Revolutions per minute (RPM).
- Multiply by 0.0166667 to perform the conversion.
- The result is your value expressed in Hertz (rotational) (Hz).
Conversion Factor
1 RPM = 0.0166667 Hz
Reverse Factor
1 Hz = 60 RPM
Worked Example
Convert 25 Revolutions per minute to Hertz (rotational): 25 RPM = 0.416667 Hz
About Revolutions per minute (RPM)
A rotational-speed unit counting complete 360° turns per minute (1 RPM = 2π/60 rad/s ≈ 0.1047 rad/s = 6°/s). RPM is the dominant everyday rotational-speed unit on tachometers, motor nameplates, and machinery specifications. Reference values: automotive engine idle 700-900 RPM, redline 6,000-9,000 RPM for naturally-aspirated gasoline cars (Honda S2000 F20C 9,000 RPM, Lexus LFA 1LR-GUE 9,500 RPM, F1 V10 engines pre-2014 18,000-20,000 RPM); turbomachinery (steam turbines 3,000 RPM for 50 Hz grid-synchronous / 3,600 RPM for 60 Hz grid; modern aeroderivative gas-turbine 3,600-9,500 RPM depending on shaft); machine tools (typical CNC milling spindle 8,000-24,000 RPM, high-speed machining 30,000-60,000 RPM); hard-disk-drive spindles 5,400 / 7,200 / 10,000 / 15,000 RPM (the last in enterprise SAS drives); ceiling fans 200-300 RPM; washing-machine spin cycles 800-1,600 RPM. Converting RPM to rad/s (multiply by π/30 ≈ 0.1047) is routine for rotor-dynamic analysis and FEA.
About Hertz (rotational) (Hz)
Rotational frequency expressed in cycles per second — dimensionally identical to rev/s (1 Hz = 1 rev/s = 60 RPM = 2π rad/s) but more common in physics, vibration analysis, and rotor-dynamics contexts where the frequency-domain interpretation matters. Used in: rotor-dynamics critical-speed studies per API 684 and ISO 21940 (the first-bending-mode critical speed of a 200 MW steam turbine rotor is typically 25-35 Hz, well separated from the 50/60 Hz grid synchronous speed at 50/60 Hz exactly), NDT (Non-Destructive Testing) vibration surveys per ISO 10816, FFT spectral analysis of rotating-machinery vibration signatures (the 1× = running speed peak, 2× = misalignment, 3-10× = blade-pass or gear-mesh frequencies depending on machine type), and balancing-machine output per ISO 1940 / ISO 21940-11. NOT to be confused with Hz as an electrical / temporal / oscillatory frequency (though they share the same underlying '1/s' dimension and are sometimes deliberately conflated in spectral analysis).
Quick Facts
- 1 Revolutions per minute equals 0.0166667 Hertz (rotational)
- 1 Hertz (rotational) equals 60 Revolutions per minute
- Revolutions per minute is a unit of angular velocity
- Hertz (rotational) is a unit of angular velocity
- This conversion is commonly used in motor specifications, rotating machinery, and mechanical design
- The Hertz (rotational) belongs to the metric system
Common Revolutions per minute to Hertz (rotational) Conversions
| Revolutions per minute (RPM) | Hertz (rotational) (Hz) |
|---|---|
| 0.01 | 0.000166667 |
| 0.1 | 0.00166667 |
| 0.25 | 0.00416667 |
| 0.5 | 0.00833333 |
| 1 | 0.0166667 |
| 2 | 0.0333333 |
| 3 | 0.05 |
| 5 | 0.0833333 |
| 10 | 0.166667 |
| 15 | 0.25 |
| 20 | 0.333333 |
| 25 | 0.416667 |
| 50 | 0.833333 |
| 75 | 1.25 |
| 100 | 1.66667 |
| 250 | 4.16667 |
| 500 | 8.33333 |
| 1000 | 16.6667 |
| 5000 | 83.3333 |
| 10000 | 166.667 |
Understanding Revolutions per minute
The Revolutions per minute (symbol: RPM) is a unit of angular velocity. A rotational-speed unit counting complete 360° turns per minute (1 RPM = 2π/60 rad/s ≈ 0.1047 rad/s = 6°/s). RPM is the dominant everyday rotational-speed unit on tachometers, motor nameplates, and machinery specifications. Reference values: automotive engine idle 700-900 RPM, redline 6,000-9,000 RPM for naturally-aspirated gasoline cars (Honda S2000 F20C 9,000 RPM, Lexus LFA 1LR-GUE 9,500 RPM, F1 V10 engines pre-2014 18,000-20,000 RPM); turbomachinery (steam turbines 3,000 RPM for 50 Hz grid-synchronous / 3,600 RPM for 60 Hz grid; modern aeroderivative gas-turbine 3,600-9,500 RPM depending on shaft); machine tools (typical CNC milling spindle 8,000-24,000 RPM, high-speed machining 30,000-60,000 RPM); hard-disk-drive spindles 5,400 / 7,200 / 10,000 / 15,000 RPM (the last in enterprise SAS drives); ceiling fans 200-300 RPM; washing-machine spin cycles 800-1,600 RPM. Converting RPM to rad/s (multiply by π/30 ≈ 0.1047) is routine for rotor-dynamic analysis and FEA.
Revolutions per minute are commonly used in motor specifications, rotating machinery, and mechanical design.
Understanding Hertz (rotational)
The Hertz (rotational) (symbol: Hz) is a unit of angular velocity. Rotational frequency expressed in cycles per second — dimensionally identical to rev/s (1 Hz = 1 rev/s = 60 RPM = 2π rad/s) but more common in physics, vibration analysis, and rotor-dynamics contexts where the frequency-domain interpretation matters. Used in: rotor-dynamics critical-speed studies per API 684 and ISO 21940 (the first-bending-mode critical speed of a 200 MW steam turbine rotor is typically 25-35 Hz, well separated from the 50/60 Hz grid synchronous speed at 50/60 Hz exactly), NDT (Non-Destructive Testing) vibration surveys per ISO 10816, FFT spectral analysis of rotating-machinery vibration signatures (the 1× = running speed peak, 2× = misalignment, 3-10× = blade-pass or gear-mesh frequencies depending on machine type), and balancing-machine output per ISO 1940 / ISO 21940-11. NOT to be confused with Hz as an electrical / temporal / oscillatory frequency (though they share the same underlying '1/s' dimension and are sometimes deliberately conflated in spectral analysis).
It belongs to the metric measurement system.
Hertz (rotational) are commonly used in motor specifications, rotating machinery, and mechanical design.
Why Convert Revolutions per minute to Hertz (rotational)?
Converting between Revolutions per minute and Hertz (rotational) is a frequent requirement for engineers, scientists, and students working with angular velocity values. Different industries and regions favour different unit systems, so having a dependable conversion tool saves time and prevents errors in technical calculations. Whether you are verifying a specification sheet, cross-checking simulation results, or preparing a report for an international audience, accurate angular velocity conversion is essential.
Frequently Asked Questions
How do I convert Revolutions per minute to Hertz (rotational)?
A rotational-speed unit counting complete 360° turns per minute (1 RPM = 2π/60 rad/s ≈ 0. To convert Revolutions per minute to Hertz (rotational), multiply by 0.0166667. For example, 25 RPM equals 0.416667 Hz.
How many Hertz (rotational) are in 1 Revolutions per minute?
There are 0.0166667 Hertz (rotational) in 1 Revolutions per minute.
How many Revolutions per minute are in 1 Hertz (rotational)?
There are 60 Revolutions per minute in 1 Hertz (rotational).
What is the formula for Revolutions per minute to Hertz (rotational) conversion?
The formula is: multiply by 0.0166667. This means 1 RPM = 0.0166667 Hz.
Is a Revolutions per minute bigger than a Hertz (rotational)?
Yes. One Revolutions per minute is larger than one Hertz (rotational) because 1 RPM equals 0.0166667 Hz, which is less than 1.
When do you need to convert between Revolutions per minute and Hertz (rotational)?
Rotational frequency expressed in cycles per second — dimensionally identical to rev/s (1 Hz = 1 rev/s = 60 RPM = 2π rad/s) but more common in physics, vibration analysis, and rotor-dynamics contexts where the frequency-... Revolutions per minute and Hertz (rotational) are both angular velocity units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.