24 Hour Timer

24 hours = 1,440 minutes = 86,400 seconds

24 : 00 : 00

 

About this 24 hour timer

Full day countdown timer for event anticipation, 24-hour challenge tracking, and medication cycles.

Press start and the timer shows exactly when your 24 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 24 hour timer for

  • 24-hour fasts and challenges
  • Epoxy, glue and sealant curing (many need 24 hours)
  • Turkey and pork brines
  • Counting down to tomorrow's event

24 hours at a glance

In minutes1,440 minutes
In seconds86,400 seconds
Halfway point12 hours
Share of a day100%
Start now and it ends at—

How to use the 24 hour timer

  1. The timer is ready at 24:00:00. Tap Edit time to change it.
  2. Press Start Timer (or the space bar). The finish time appears under the digits.
  3. Press Full screen to fill the screen — handy for classrooms, meetings and kitchens.
  4. 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 do I count down 24 hours?

Press Start Timer. The countdown shows 24:00:00 and the line underneath shows the day and time it ends. You can close the tab and come back — the countdown is stored in your browser.

How many minutes and seconds are in 24 hours?

24 hours is 1,440 minutes, or 86,400 seconds.

Can the timer count down to a specific time instead?

Use Edit time to enter the exact hours and minutes left, for example 23 h 15 m. The finish time is shown right under the digits.

How do I set a 24 hour timer?

Press Start Timer — it is already set to 24:00:00. 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.

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