21 minute timer
Press Start and an alarm will ring in exactly 21 minutes. Good for a study block, a workout, or a meeting.
21 minutes is 1,260 seconds, or 35% of an hour. The timer keeps exact time in a background tab and shows the time left in the tab title. Press Space to pause, R to reset, F for full screen.
Other timers
Seconds
Minutes and hours
- 1 min
- 2 min
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- 1 hr
- 75 min
- 90 min
- 2 hr
- 3 hr
Set a custom timer · Stopwatch · Pomodoro timer · Classroom timer