The calculation, without hidden assumptions
Frequency and period are reciprocal descriptions of the same repeating event. Frequency counts cycles per second, while period measures the time for one cycle. This calculator keeps both directions on one canonical page, converts the entered unit to SI before applying 1/x, then returns practical secondary units so a 20 kHz switching signal is readable in microseconds instead of a long decimal in seconds.
How to use this calculator
Choose whether you are starting from frequency or period.
Enter the value and its unit; the calculator converts to hertz or seconds before applying the reciprocal relationship.
Read the result in several useful units and use the reverse check to confirm the original value.
Where people use it
- •Switching-frequency timing checks
- •Waveform and sensor timing
- •Converting oscilloscope periods to frequency
Example: 20 kHz switching frequency
20 kHz is 20,000 Hz. The period is 1 ÷ 20,000 second = 0.00005 s, which is 50 µs per cycle.
What the result does not assume
- •Frequency and period describe an ideal repeating rate. Jitter, modulation and changing cycle time are not represented by one reciprocal value.
- •This page converts timing quantities only; it does not infer wavelength because wave speed is not part of the input.
Frequently asked questions
Is frequency always 1 divided by period?+
For a repeating event with one defined cycle period, yes: f = 1/T and T = 1/f.
What is the period of 60 Hz?+
1 ÷ 60 second is about 0.01667 s, or 16.67 ms per cycle.
Why combine both directions on one page?+
Frequency and period are exact reciprocal forms of one relationship, so one canonical tool avoids two thin competing pages.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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