Frequency to Period Calculator
Enter a positive frequency or period and calculate the reciprocal value.
A QUICK WALKTHROUGH
How to use this tool
- Choose frequency or period as the input.
- Enter a positive value in Hz or seconds.
- Read the reciprocal result.
Reciprocal relationship
Frequency f = 1 ÷ T and period T = 1 ÷ f. The result is ideal and does not account for jitter or measurement uncertainty.
Input boundary
Enter one finite positive value. Frequency uses hertz (cycles per second); period uses seconds.
Local calculation
The conversion runs in your browser and does not upload or store input.
GOOD TO KNOW
Common questions
What is the unit of period?
The primary result is seconds; the tool also shows milliseconds when converting from frequency.
Can I enter kHz or ms directly?
Convert to Hz or seconds first: 1 kHz = 1000 Hz and 1 ms = 0.001 s.
Does this measure a real signal?
No. It applies the reciprocal formula to the value you provide.