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Instant result
The result is updated directly from the data entered.
Online Calculator
Frequency and period calculator
Enter a frequency in Hz and calculate how long each cycle lasts in seconds and milliseconds.
Period (s)
0.02
Period (ms)
20
Formula: period = 1 ÷ frequency.
Information
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Local processing
The calculations are done in your browser without sending the values to a server.
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Free
No registration, subscription, or paid API required.
Frequently asked questions
What is the relationship between frequency and period?
They are reciprocal quantities: T = 1/f.
What does Hz mean?
Hertz, i.e. cycles per second.
Can the frequency be zero?
Not for this calculation, because it would involve dividing by zero.
Does it show milliseconds?
Yes.