What is this tabata timer set to when the page opens?

20 seconds of work, 10 seconds of rest, 8 rounds, warm up 0 and cool down 0. The clock reads 00:20 against the label Work, round 1 of 8 before you have touched anything, the line under it says 8 rounds of 20 s work and 10 s rest, total 4:00, and the strip shows all 16 intervals in order. Those five numbers are the fields directly below, so any of them can be changed on the spot.

Why does a tabata set come to 4:00 and not 3:50?

Eight work intervals of 20 seconds plus eight rests of 10 seconds equal 240 seconds, or 4:00. Without the final rest the sequence would end at 3:50. Here that last rest is visible in the strip and included in the total.

Can I change the 20 and 10, or add a warm up and a cool down?

Yes. Every timing is a plain field: type 30 and 15 for a longer round, or put 60 in the warm up and it becomes the first interval of the sequence. Seconds are typed as a number, or as minutes and seconds like 1:30. A warm up or a cool down of 0 is left out of the sequence rather than shown as an empty step, and a rest of 0 gives back to back work intervals. The strip and the total are recomputed as you type, and a value that cannot be read is refused with a message naming the field.

Does the timer keep time if I switch tabs or lock my phone?

Elapsed time is calculated from the system clock, and the display catches up when the browser resumes updates. Audio cues can be delayed or missed when a tab is throttled or a device sleeps. Closing the tab ends the session, and a system clock change can affect the reading.

Is there a beep between the work and rest intervals?

Yes, and it is optional. The page synthesises a short two note cue with Web Audio rather than downloading a sound file, so it works with no network: rising into a work interval, falling into a rest, and three falling notes when the session ends. The Cue button turns it off and on. One browser rule applies to every site: a click on the page is needed before any sound can play, and pressing Start is that click.

Does opening this page change the timings I saved on the interval timer?

Opening it does not. This page sets the five timings to the tabata pattern whatever your browser last used, which is the point of having it, and nothing is written back until you change something yourself. Your cue setting still restores. Change a number here and that change is remembered in this browser, exactly as it is on the main tool, and the Start over button at the top of the page forgets it again.

How do I move around the eight rounds while it is running?

Skip jumps to the start of the next interval, Restart goes back to the beginning of round 1, and any of the 16 chips in the strip can be clicked or tabbed to in order to jump straight there. Moving changes the elapsed time rather than a counter, so the reading stays exact wherever you land. Copy plan puts the whole session on the clipboard as text, one line per interval with the time it starts and the time it ends.

Is this also a HIIT interval timer?

It repeats the work and rest durations you choose and shows each round. The page begins with the named 20/10 timing pattern, but you can edit the durations and rounds. It supplies no exercise routine or instructions for effort.

Can I play Tabata music through this timer?

No music or spoken countdown is supplied. The Cue switch controls synthesized interval beeps. Audio permission and background browser restrictions can delay or prevent cues.

Can I use it on Android, iPhone or a computer?

Yes, through a current browser. Press Start to permit sound. There is no native watch app or guarantee of cues while a device sleeps.

Tabata Timer

This page opens on 20 seconds of work, 10 seconds of rest and eight rounds, with no warm up or cool down. The timer below shows all 16 intervals and a 4:00 total, including the final rest. Press Start or edit any timing. Tabata here names a timing pattern, without exercise instructions.

Work, round 1 of 800:208 rounds of 20 s work and 10 s rest. Total 4:00, the last rest counted.

Warm up: s
Work: s
Rest: s
Rounds
Cool down: s
Total: 4:00

Ready. Press Start to begin the first interval.

Tabata pattern20 on, 10 off, 8 rounds
4:00
45 on, 15 off8 rounds, 1 min warm up and 2 min cool down
11:00
One minute rounds60 on, no rest, 10 rounds
10:00

A round is one work interval followed by one rest interval, and the last rest is counted like every other one, which is why eight rounds of 20 and 10 come to 4:00 rather than 3:50. Type seconds, or minutes and seconds as 1:30. Skip moves to the next interval and any interval in the strip can be jumped to. Tabata is the name of a timing pattern, 20 seconds on and 10 off for eight rounds, and that is all this page means by it.

Exact about elapsed time. Exact to the timestamps your browser reports, so it does not drift while the tab is in the background. It is a timer and nothing else: the tabata pattern is a named timing pattern, not an exercise prescription.

Common questions

What is this tabata timer set to when the page opens?: 20 seconds of work, 10 seconds of rest, 8 rounds, warm up 0 and cool down 0. The clock reads 00:20 against the label Work, round 1 of 8 before you have touched anything, the line under it says 8 rounds of 20 s work and 10 s rest, total 4:00, and the strip shows all 16 intervals in order. Those five numbers are the fields directly below, so any of them can be changed on the spot.
Why does a tabata set come to 4:00 and not 3:50?: Eight work intervals of 20 seconds plus eight rests of 10 seconds equal 240 seconds, or 4:00. Without the final rest the sequence would end at 3:50. Here that last rest is visible in the strip and included in the total.
Can I change the 20 and 10, or add a warm up and a cool down?: Yes. Every timing is a plain field: type 30 and 15 for a longer round, or put 60 in the warm up and it becomes the first interval of the sequence. Seconds are typed as a number, or as minutes and seconds like 1:30. A warm up or a cool down of 0 is left out of the sequence rather than shown as an empty step, and a rest of 0 gives back to back work intervals. The strip and the total are recomputed as you type, and a value that cannot be read is refused with a message naming the field.
Does the timer keep time if I switch tabs or lock my phone?: Elapsed time is calculated from the system clock, and the display catches up when the browser resumes updates. Audio cues can be delayed or missed when a tab is throttled or a device sleeps. Closing the tab ends the session, and a system clock change can affect the reading.
Is there a beep between the work and rest intervals?: Yes, and it is optional. The page synthesises a short two note cue with Web Audio rather than downloading a sound file, so it works with no network: rising into a work interval, falling into a rest, and three falling notes when the session ends. The Cue button turns it off and on. One browser rule applies to every site: a click on the page is needed before any sound can play, and pressing Start is that click.
Does opening this page change the timings I saved on the interval timer?: Opening it does not. This page sets the five timings to the tabata pattern whatever your browser last used, which is the point of having it, and nothing is written back until you change something yourself. Your cue setting still restores. Change a number here and that change is remembered in this browser, exactly as it is on the main tool, and the Start over button at the top of the page forgets it again.
How do I move around the eight rounds while it is running?: Skip jumps to the start of the next interval, Restart goes back to the beginning of round 1, and any of the 16 chips in the strip can be clicked or tabbed to in order to jump straight there. Moving changes the elapsed time rather than a counter, so the reading stays exact wherever you land. Copy plan puts the whole session on the clipboard as text, one line per interval with the time it starts and the time it ends.
Is this also a HIIT interval timer?: It repeats the work and rest durations you choose and shows each round. The page begins with the named 20/10 timing pattern, but you can edit the durations and rounds. It supplies no exercise routine or instructions for effort.
Can I play Tabata music through this timer?: No music or spoken countdown is supplied. The Cue switch controls synthesized interval beeps. Audio permission and background browser restrictions can delay or prevent cues.
Can I use it on Android, iPhone or a computer?: Yes, through a current browser. Press Start to permit sound. There is no native watch app or guarantee of cues while a device sleeps.

Exact to the timestamps your browser reports, so it does not drift while the tab is in the background. It is a timer and nothing else: the tabata pattern is a named timing pattern, not an exercise prescription.