21 minute timer
21 minutes
The countdown is running. Your browser will not let a page play sound until you interact with it — tap anywhere to arm the alarm.
- In seconds
- 1,260
- As a fraction of an hour
- 7⁄20
- Fit in a day
- —
- ISO 8601
- PT21M
Other timers
About this timer
It keeps time against your device’s clock rather than by counting ticks, so it stays accurate in a background tab, where browsers throttle timers to once a minute or less. Switch away and come back and it will be right.