Frequency Unit Converter

Formula or method

Output = input × source frequency factor ÷ destination frequency factor, through Hz. One Hz is one cycle per second. kHz = 1,000 Hz, MHz = 1,000,000 Hz, GHz = 1,000,000,000 Hz. Revolutions per minute ÷ 60 gives cycles per second.

How to use this calculator

1. Enter the Value to convert. The interface starts with 1; replace it with your measurement or quantity. Blank, nonnumeric and out-of-range values cannot produce a result.
2. Select From unit for the source unit. Match the complete label, including square/cubic units, decimal/binary prefixes or the gallon system when applicable.
3. Select To unit for the destination unit, then read Converted value with its unit label.
4. Try the worked example with its stated source and destination units. Results show at most eight fractional digits; very small nonzero values use scientific notation. Check the page limitations before interpreting the output.

Worked example

Select revolutions per minute (rpm) → hertz (Hz), then enter 1,800. Compute 1,800 ÷ 60 = 30 Hz. Separately, 2.4 MHz gives 2,400 kHz.

Understanding the result

For rpm, one full revolution is treated as one cycle. A 30 Hz result means 30 cycles each second; it does not mean 30 radians per second.

Limitations and assumptions

• Use a nonnegative frequency. The rpm conversion assumes one cycle per revolution, not multiple pulses or teeth per revolution.
• Angular velocity in rad/s requires the additional factor 2π; period requires a reciprocal. Neither is provided here.

Frequently asked questions

Sources

• NIST: SI base and derived units
• NIST SP 330: non-SI units accepted with the SI