Frequency Calculator
Calculate the frequency of a wave given its period, or vice versa. Also supports wavelength and speed calculations.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator computes frequency, period, or wave speed using the standard wave equations. Follow these steps:
- Enter known values into any of the four fields:
- Period (T) – time for one cycle in seconds
- Frequency (f) – cycles per second in Hertz
- Wavelength (λ) – distance between wave crests in meters
- Wave Speed (v) – propagation speed in m/s (defaults to 343 m/s, sound in air)
- Leave at least one field empty – the calculator will compute the missing value(s).
- Click Calculate or press Enter in any field.
- The result appears in the green box, and the formula used is shown below it.
Tips:
- All values must be positive numbers.
- Use metric units only (seconds, meters, m/s, Hz).
- If you enter both Period and Frequency, the calculator checks if they are consistent (T × f should equal 1).
- If you enter Wavelength without Speed, the default speed of 343 m/s is used.
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Frequently Asked Questions
Frequency is the reciprocal of the period: f = 1 / T. For example, if the period is 0.02 seconds, the frequency is 50 Hz.
The default wave speed is 343 m/s, which is the speed of sound in air at room temperature. You can change it for other media.
Yes, wavelength λ = v / f. Enter the frequency and speed, and leave the wavelength field empty, then click Calculate.