Frequency and Period Calculator
Convert between frequency and the time for one complete cycle.
Formula
f = 1/T; T = 1/f
Known period: 20 ms · Known frequency: 50 Hz · Frequency (Hz) ≈ 1÷(20 ms × 0.001 s/ms) · Period (s) ≈ (20 ms × 0.001 s/ms)
How to use
- Choose frequency or period to find.
- Enter the known value and unit.
- Read the result; the other input is ignored.
Examples
- A period of 20 ms means 50 Hz.
Frequently asked questions
What does hertz mean?
One hertz is one cycle per second.
Is a period half a cycle?
No. It is the time for one complete repeating cycle.
Can I enter zero?
No. The reciprocal is undefined at zero.
Sources
Updated: