Quick answer
Frequency units convert through hertz. 60 revolutions per minute equals 1 Hz, because 60 ÷ 60 seconds = 1 per second.
Enter a value and choose the units. The calculator returns the converted frequency.
Related tools: Wavelength to Frequency Calculator: Frequency of an electromagnetic wave from its wavelength in vacuum. Period to Frequency Calculator: Frequency from period, or period from frequency. Relative Frequency Calculator: Relative frequencies and percentages from counts.
How to use the Frequency Converter
- Enter value.
- Choose from: Hertz (Hz), Kilohertz (kHz), Megahertz (MHz), Gigahertz (GHz), Terahertz (THz) and Revolutions per minute (rpm) and 1 more.
- Choose to: Hertz (Hz), Kilohertz (kHz), Megahertz (MHz), Gigahertz (GHz), Terahertz (THz) and Revolutions per minute (rpm) and 1 more.
- Enter decimal places (between 0 and 10). It starts at 4.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Value | A number | — |
| From | Choose one: Hertz (Hz); Kilohertz (kHz); Megahertz (MHz); Gigahertz (GHz); Terahertz (THz); Revolutions per minute (rpm); Cycle per second (cps) | Starts at Hertz (Hz) |
| To | Choose one: Hertz (Hz); Kilohertz (kHz); Megahertz (MHz); Gigahertz (GHz); Terahertz (THz); Revolutions per minute (rpm); Cycle per second (cps) | Starts at Kilohertz (kHz) |
| Decimal places | A number | ≥ 0, ≤ 10, starts at 4 |
Formula and method
Formula
result = value × (factor of source ÷ factor of target), base unit: hertz
IEEE-754 double precision; displayed to the chosen number of decimal places (default 4). Very small or large results are shown in scientific notation.
Every unit is defined by an exact or published factor to the base unit (hertz). The value is multiplied by the source factor and divided by the target factor.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Value = 60; From = Revolutions per minute (rpm); To = Hertz (Hz); Decimal places = 4.
| Result | Value |
|---|---|
| Revolutions per minute (rpm) → Hertz (Hz) | 1 |
| Input | 60 Revolutions per minute (rpm) |
Example 2
Inputs: Value = 1; From = Gigahertz (GHz); To = Megahertz (MHz); Decimal places = 4.
| Result | Value |
|---|---|
| Gigahertz (GHz) → Megahertz (MHz) | 1,000 |
| Input | 1 Gigahertz (GHz) |
Example 3
Inputs: Value = 2.4; From = Gigahertz (GHz); To = Megahertz (MHz); Decimal places = 4.
| Result | Value |
|---|---|
| Gigahertz (GHz) → Megahertz (MHz) | 2,400 |
| Input | 2.4 Gigahertz (GHz) |
The first line is the headline result (revolutions per minute (rpm) → Hertz (Hz)). Below it the frequency Converter lists input, which describe the same case from other angles. IEEE-754 double precision; displayed to the chosen number of decimal places (default 4). Very small or large results are shown in scientific notation.
Unit reference
Each unit expressed in the base unit used for the calculation. Conversions go through this base unit, so any unit can be converted to any other in the table.
| Unit | Equals (in hertz) |
|---|---|
| Hertz (Hz) | 1 |
| Kilohertz (kHz) | 1000 |
| Megahertz (MHz) | 1000000 |
| Gigahertz (GHz) | 1000000000 |
| Terahertz (THz) | 1000000000000 |
| Revolutions per minute (rpm) | 0.01666666667 |
| Cycle per second (cps) | 1 |
Common values
1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz, 1 GHz = 10⁹ Hz. A 3,000 rpm engine turns at 50 Hz, and mains electricity is 50 or 60 Hz depending on the country.
Period
The period is the inverse of the frequency: 50 Hz has a period of 0.02 s. Use the Period to Frequency calculator for that conversion.
How the result changes with value
Holding every other input at the first worked example, this table changes only value. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Value | Revolutions per minute (rpm) → Hertz (Hz) | Input |
|---|---|---|
| 30 | 0.5 | 30 Revolutions per minute (rpm) |
| 60 | 1 | 60 Revolutions per minute (rpm) |
| 120 | 2 | 120 Revolutions per minute (rpm) |
| 240 | 4 | 240 Revolutions per minute (rpm) |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Value: left empty shows "Enter value." beside that field and no result.
Choosing between the Frequency Converter and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Wavelength to Frequency Calculator](/converters/wavelength-to-frequency/) | wavelength | Frequency |
| [Period to Frequency Calculator](/converters/period-to-frequency/) | convert and value | Frequency (Hz) |
| [Relative Frequency Calculator](/statistics/relative-frequency/) | counts | Relative frequencies |
| [LC Resonant Frequency Calculator](/engineering/resonant-frequency-lc/) | inductance and capacitance | Resonant frequency |
| [Weight Converter](/converters/weight-converter/) | value, from and to | Pound (lb) → Gram (g) |
Background: unit conversion
Many customary units are defined exactly in terms of metric ones: since the 1959 International Yard and Pound Agreement an inch is exactly 2.54 cm and a pound is exactly 0.45359237 kg (NIST SP 811 lists these). So most length and mass conversions are exact apart from the rounding of the displayed result.
To convert, multiply the value by the source unit's factor to reach the base unit, then divide by the target unit's factor; the unit table on this page lists every factor used. Temperature and fuel economy are the exceptions, because they are not simple multiples.
Assumptions and limitations
- Negative values are allowed
- Zero converts to zero (except L/100 km, where zero is invalid)
- Units from different quantities cannot be converted
- Very large or tiny results switch to exponent notation
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for value to confirm this.
Frequently asked questions
How many Hz is 1 rpm?
One rpm is 1/60 Hz, about 0.0167 Hz.
What is 2.4 GHz?
2.4 GHz is 2,400,000,000 Hz (2.4 × 10⁹ cycles per second), the band used by many Wi-Fi devices.
Is rpm a frequency?
Yes, it counts revolutions per minute.
What does the Frequency Converter calculate?
Convert hertz, kilohertz, megahertz, gigahertz and rpm. It returns Revolutions per minute (rpm) → Hertz (Hz) and Input.
What formula does the Frequency Converter use?
result = value × (factor of source ÷ factor of target), base unit: hertz. Every unit is defined by an exact or published factor to the base unit (hertz).
What does the “From” option change?
It sets how the frequency is worked out. The choices are Hertz (Hz), Kilohertz (kHz), Megahertz (MHz), Gigahertz (GHz), Terahertz (THz), Revolutions per minute (rpm) and Cycle per second (cps).
What is an example of a frequency result?
With value 60, from Revolutions per minute (rpm), to Hertz (Hz) and decimal places 4, the revolutions per minute (rpm) → Hertz (Hz) is 1.
Where does the method come from?
The method follows: BIPM SI Brochure (9th ed.).
Related calculators
- Wavelength to Frequency Calculator — Frequency of an electromagnetic wave from its wavelength in vacuum.
- Period to Frequency Calculator — Frequency from period, or period from frequency.
- Relative Frequency Calculator — Relative frequencies and percentages from counts.
- Weight Converter — Convert kilograms, pounds, ounces, stone and more.
- Length Converter — Convert between metric and imperial lengths.
Sources
- BIPM SI Brochure (9th ed.)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.