Interval Timer
An interval timer runs work and rest rounds for you, so the only thing you have to do is start and keep going.
How to Use the Interval Countdown Timer
Open the timer
This page is already set to 0:40. Press the start button and the countdown begins, with no setup and no signup.
Press F for fullscreen
The digits scale to fill the whole screen, so the remaining time stays readable from the back of a room, a classroom or a gym.
Keep the block visible
Use the subtitle to say what the Interval timer is for. A countdown with a name on it is much easier to come back to.
The bell ends it
An audible alert rings when the 0:40 countdown reaches zero, so you never have to watch the screen to know it is over.
Why Use This Interval Timer
Work and rest, set for you
Forty seconds of work, twenty seconds of rest, ten rounds. The timer switches between them on its own, so you never have to guess what comes next.
A round counter on screen
You always know which round you are on and how much is left in it. The digits fill the display, readable from across a room.
A sound at every change
A bell marks the end of every work round and every rest, so you can train without staring at the screen the whole time.
Share the exact session
Copy the link and the other person gets the same work and rest rounds, the same number of rounds and the same settings.
Where This Timer Helps
Interval training is simple to describe and hard to run. Forty seconds of work, twenty seconds of rest, and repeat for ten rounds. The hard part is tracking the switches, especially when you are out of breath and the last thing you want to do is look at a phone.
This interval timer is preloaded with forty seconds of work and twenty seconds of rest, for ten rounds. It counts the rounds for you, shows the remaining time on screen, and sounds a bell at every change, so the pace is set by the timer instead of by your guesswork.
Tips for making the most of it
- Put the phone where you can see it without picking it up, so checking the time never breaks your stance.
- Use the subtitle to name the exercise, so the screen tells the group what the next round is.
- Ten rounds of forty and twenty takes ten minutes, which is enough for a warm up and a cooldown together.
Interval Timer: Frequently Asked Questions
How does the interval timer switch between work and rest?
It counts forty seconds of work and twenty seconds of rest, then starts the next round on its own. The bell sounds at every change and the round counter shows where you are, so you can follow the session without watching a phone.
Can I change the work and rest times?
Yes. The work length, the rest length and the number of rounds can all be adjusted in the timer controls. The page starts with forty seconds of work, twenty seconds of rest and ten rounds, which is the most common setup.
Does it work without a connection?
Yes. After the first visit the timer is cached by your browser, so the rounds keep running and the bell keeps sounding even if the wifi drops. It also installs as an app if you prefer an icon on your home screen.
Other Countdown Timer Lengths
Need a different duration? Every one of these opens the same timer with the length already set.
40-20 HIIT timer
The classic forty twenty interval: work for forty seconds, rest for twenty, and keep going.
30-30 Tabata timer
Tabata in its purest form: thirty seconds on, thirty seconds off, eight rounds.
30 minute timer
Half an hour, on screen, with nothing else to look at. It is the most useful unit of a working day.
5 minute timer
Five minutes is the most useful short interval there is. It is long enough to get something done and short enough to actually do it.
All Full Screen Countdown Timers
1 minute timer
1 Minute Countdown Timer
2 minute timer
2 Minute Countdown Timer
3 minute timer
3 Minute Countdown Timer
5 minute timer
5 Minute Countdown Timer
10 minute timer
10 Minute Countdown Timer
15 minute timer
15 Minute Countdown Timer
20 minute timer
20 Minute Countdown Timer
30 minute timer
30 Minute Countdown Timer
45 minute timer
45 Minute Countdown Timer
1 hour timer
1 Hour Countdown Timer
90 minute timer
90 Minute Countdown Timer
2 hour timer
2 Hour Countdown Timer
3 hour timer
3 Hour Countdown Timer
24 hour timer
24 Hour Countdown Timer
5 minute break timer
5 Minute Break Timer
10 minute break timer
10 Minute Break Timer
10 minute meditation timer
Meditation Timer
40-20 HIIT timer
40-20 HIIT Timer
30-30 Tabata timer
30-30 Tabata Timer
5 seconds timer
5 Second Countdown Timer
Presentation timer
Presentation Timer
Exam timer
Exam Timer
Event date timer
Countdown to a Date