3 Hour Timer

Press Start to count down 3 hours.

This free 3 hour timer counts down 3 hours with a shrinking red disc you can read at a glance. 3 hours is 10,800 seconds (ten thousand eight hundred seconds), or 180 minutes. It fits a long exam, proving bread and a marathon training run.

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What a 3 hour timer is good for

Three hours is long enough that most people lose track of it. A visible countdown keeps a long exam, a bread prove or a long training run on schedule without checking a clock every few minutes.

A long exam

Some final exams and professional papers last three hours.

Proving bread

Slow, cool proves of two to three hours give bread more flavour.

A marathon training run

Long runs in marathon training plans often reach three hours.

A slow braise

Beef short ribs and lamb shanks braise for about three hours.

To pace yourself, glance at the disc rather than the numbers. With the 3 hour timer running, half the colour has gone after 1 hour 30 minutes, and when only a quarter is left you have 45 minutes to wrap up. Open fullscreen if the timer needs to be read across a room, and add a label so everyone knows what the 3 hours are for.

How to use the 3 hour timer

  1. It is ready

    The dial is already set to 3 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.

3 hours in other units

3 hours equals
Seconds10,800
Minutes180
Hours3
Days0.125
Fraction of a day1/8

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 10,800 seconds in 3 hours, which is 180 minutes.

A three hour exam, a slow bread prove, a long marathon training run or a slow braise of beef or lamb.

Yes. The 3 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 3 hours are up.

No. The 3 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 3 hours is readable from the back of the room.

Yes, once this page has loaded. Nothing is sent over the network while the 3 hours count down, so a dropped connection will not stop the timer.

One hundred and eighty minutes, which is 10,800 seconds.

When the 3 hours are up the disc is empty, the screen shows Time’s up! and your alarm plays until you press Stop. It stops by itself after five minutes.

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