How to set up a custom interval workout timer

Step by step

1. Enter preparation time, work duration, rest duration and number of rounds in the timer.
2. Choose whether to enable sound cues.
3. Start the timer; use Pause and Resume if needed.
4. Reset before changing settings for another session. Keep the page visible for reliable cues.

Worked example

With 10 seconds preparation, eight 30-second work periods and seven 15-second rests, the session lasts 10 + 8 × 30 + 7 × 15 = 355 seconds, or 5 minutes 55 seconds.

The timer omits rest after the final round. Its duration is preparation + rounds × work + (rounds − 1) × rest.

Check your result

Test the sound before relying on it. A browser may suspend audio or timers when the screen is locked or the page is in the background.

The timer organizes durations you choose. It does not assess exercise technique or prescribe intensity.