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Interval Timer

Run repeated work and rest rounds with adjustable lengths, a round counter and a beep.

Run an interval timer

Phase: Ready
Countdown: —
Round: — · Total left: —
The countdown is measured from the system clock rather than counted ticks, so it stays accurate in a busy tab.

How to use the Interval Timer

  1. Set the work seconds, the rest seconds and the number of rounds.
  2. Add a prepare countdown if you need time to get into position.
  3. Press Start, pause whenever you need to, and press Reset to begin again.

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Frequently Asked Questions

Common questions about the free online interval timer.

It alternates a work period and a rest period for the number of rounds you set, with a beep at every phase change so you can train hands free.
Common choices are forty seconds of work with twenty seconds of rest, or sixty seconds of work with thirty seconds of rest.
The timer measures elapsed time from the system clock instead of counting ticks, so it stays accurate even when the browser is busy.
Yes. A short tone from the Web Audio API marks each change, with a higher note for work and a lower note for rest.
It adds a countdown before the first work round so you have time to get ready. Set it to zero to start immediately.
Yes. Pause freezes the countdown and Start resumes from exactly the same point in the round.
You can run up to ninety nine rounds, with work and rest periods from one second up to one hour each.
No. The timer runs entirely in your browser and keeps working when you are offline.

Last updated: October 10, 2026