Interval timer
Work, rest, repeat. Set the seconds and rounds or pick a preset such as Tabata, and follow the beeps.
Work
Round 1 of 8
Ready
Ends 20 seconds after you press Start.
Free, no sign-up — runs in your browser. Nothing you set is sent anywhere.
Presets
Keyboard: Space start or pause, R reset, F full screen.
How it works
The timer runs an optional warm-up, then alternates work and rest for the number of rounds you set. The large label shows Work, Rest or Done, with its own color, and the line under it shows the round and how many are left.
- Before each work phase you hear three short beeps — 3, 2, 1 — and a higher tone as work starts.
- When rest starts, two lower beeps play.
- At the end of the last round, your chosen sound plays and the label shows Done.
Set rest to 0 for formats with no separate rest, such as EMOM. Changes you make while the timer is running take effect when you reset it.
The presets
- Tabata 20/10 × 8. Eight rounds of 20 seconds of all-out effort and 10 seconds of rest — four minutes in all. The format comes from a 1996 study led by Japanese researcher Izumi Tabata.
- 30/30 × 10. Equal work and rest: ten minutes, easy to pace and a common starting point for interval training.
- 40/20 × 8. A tougher ratio of two parts work to one part rest, eight minutes long.
- EMOM 60 × 10. "Every minute on the minute": start a set of reps at the top of each minute and rest for whatever is left of it, for ten minutes.
Timer modes
Single timers
Frequently asked questions
What is a Tabata workout?
Eight rounds of 20 seconds of very hard exercise, each followed by 10 seconds of rest, for four minutes in total. It is named after Izumi Tabata, who led a 1996 study using the format. Pick the Tabata preset and press Start.
What does EMOM mean?
Every minute on the minute. At the start of each minute you do a set number of reps, then rest until the next minute begins. Use the EMOM preset (60 seconds of work, no separate rest, ten rounds) and listen for the 3-2-1 beeps.
Can I follow it without looking at the screen?
Yes. Three short beeps count down to each work phase, a higher tone marks the start of work, two lower beeps mark the start of rest, and your chosen sound plays at the end.
Will the alarm go off if I switch tabs or lock my phone?
In a background tab on a computer, yes. The countdown is worked out from the real clock and the alarm is scheduled with the browser's sound engine when you press Start, so it stays on time. Phones often pause web pages while the screen is locked, so the sound may wait until you unlock; keep the screen on (the timer asks the browser to do that where it can) and the volume up. You can also turn on "Notify me when time's up" for a system notification. When you come back to the page, it shows the right state straight away.