Period and frequency
Period is the time for one full cycle. Frequency is how many cycles happen per second. A 0.02 second period corresponds to 50 Hz.
Example
If one cycle takes 0.02 seconds, frequency is 1 / 0.02 = 50 Hz. If the period gets shorter, frequency gets higher.
Common mistakes
Do not enter milliseconds as seconds without converting. A 20 ms period is 0.02 seconds, not 20 seconds.
Limitations
This calculator assumes a stable repeating signal. Irregular signals may require measurement over many cycles or spectral analysis.
Last reviewed: 2026-05-17