About this 72 hour timer
A free 72-hour countdown timer that starts with one click.
Press start and the timer shows exactly when your 72 hours will be up. It rings at zero, goes full screen for classrooms and kitchens, and remembers where it was if you refresh the page.
What people use a 72 hour timer for
- 72-hour fasts
- 72-hour emergency preparedness drills
- Return and trial windows
- Long cure and drying times
72 hours at a glance
| In minutes | 4,320 minutes |
|---|---|
| In seconds | 259,200 seconds |
| Halfway point | 36 hours |
| Share of a day | 300% |
| Start now and it ends at | — |
How to use the 72 hour timer
- The timer is ready at 72:00:00. Tap Edit time to change it.
- Press Start Timer (or the space bar). The finish time appears under the digits.
- Press Full screen to fill the screen — handy for classrooms, meetings and kitchens.
- When it reaches zero an alarm plays until you press Stop Alarm.
Keyboard shortcuts
- Space start / pause
- R reset
- F full screen
- M mute
Frequently asked questions
How many minutes are in 72 hours?
72 hours is 4,320 minutes, or 259,200 seconds.
How do I set a 72 hour timer?
Press Start Timer — it is already set to 72:00:00. To change the length, tap Edit time, enter hours, minutes and seconds, then press Set. You can also add a minute at any point with +1 min.
Will the timer keep running if I refresh or close the tab?
Yes. The end time is saved in your browser, so reopening this page shows the correct time left. To hear the alarm, keep the tab open and your device's sound on.
Does the timer work on a phone?
Yes. It runs in any modern mobile browser with no app or sign-up, and it asks your phone to keep the screen awake while it runs.