24 Hour Timer

Press Start to count down 24 hours.

This free 24 hour timer counts down 24 hours with a shrinking red disc you can read at a glance. 24 hours is 86,400 seconds (eighty-six thousand four hundred seconds), or 1,440 minutes. It is a full day, a 24 hour fast and the length of many challenges and charity events.

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What a 24 hour timer is good for

Twenty-four hours is one full turn of the Earth. It is the length of many charity challenges and hackathons, and the 24 hour fast is a well-known form of intermittent fasting.

A 24 hour fast

Some people fast from dinner to dinner once or twice a week. Talk to a doctor first if you have a health condition.

Charity challenges

Twenty-four hour sponsored events, such as dance-a-thons and gaming streams, need a clear countdown.

Hackathons

Many hackathons give teams twenty-four hours to build a project.

A deadline

Count down to something due this time tomorrow.

To pace yourself, glance at the disc rather than the numbers. With the 24 hour timer running, half the colour has gone after 12 hours, and when only a quarter is left you have 6 hours to wrap up. Open fullscreen if the timer needs to be read across a room, and add a label so everyone knows what the 24 hours are for.

How to use the 24 hour timer

  1. It is ready

    The dial is already set to 24 hours. To change it, drag the disc, tap a preset or open Custom.

  2. Press Start

    Or press the Space bar. The red disc shrinks back towards 12 o’clock as the time runs down.

  3. Watch the disc

    Read the time left at a glance, or open fullscreen for a big dial that fills the screen.

  4. Time’s up

    Your alarm plays until you press Stop. Press Reset or R to run the same time again.

24 hours in other units

24 hours equals
Seconds86,400
Minutes1440
Hours24
Days1
Fraction of a day1/1

Why use this timer

Why a visual timer helps

A shrinking disc turns time into something you can see. You read how much is left at a glance, without doing sums on a clock, and an invisible deadline feels less stressful when you can watch it approach. That is why visual timers are a staple in classrooms and are widely used by people with ADHD and autistic children and adults. Read our guide to using a visual timer, how it helps with ADHD time blindness, classroom transitions and autism.

Why this timer is accurate

The countdown is anchored to your device clock rather than counted in animation frames. It does not drift if you switch tabs or your screen sleeps: it keeps running in the background and still sounds the alarm on time. When you come back, the disc jumps straight to the correct position.

Frequently asked questions

There are 86,400 seconds in 24 hours, which is 1,440 minutes.

A dinner-to-dinner fast, a twenty-four hour charity event, a hackathon, or counting down to a deadline this time tomorrow.

Yes. The 24 hour countdown is anchored to your device clock rather than counted frame by frame, so it stays accurate in a background tab and the alarm still fires when the 24 hours are up.

No. The 24 hour timer runs in your browser on phone, tablet and desktop. It is free, and there is no account, app or download.

Yes. Press the fullscreen button or the F key. The dial fills the screen, so the remaining part of the 24 hours is readable from the back of the room.

Yes, once this page has loaded. Nothing is sent over the network while the 24 hours count down, so a dropped connection will not stop the timer.

One thousand four hundred and forty minutes, which is 86,400 seconds.

Yes, as long as the tab stays open. The countdown is tied to the device clock, so it stays accurate even if the screen sleeps.

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