Free Online Timer
An online timer is a countdown that runs in your browser and sounds an alarm at zero. Set any length, go full screen, and use it in class, at your desk, or in the kitchen.
Ready
🔔 Click or tap anywhere to turn on the alarm sound.
Space start / pause · R reset · F full screen · works with presentation clickers
Quick timers
- 30 Second Timer
- 1 Minute Timer
- 2 Minute Timer
- 3 Minute Timer
- 4 Minute Timer
- 5 Minute Timer
- 10 Minute Timer
- 12 Minute Timer
- 15 Minute Timer
- 20 Minute Timer
- 25 Minute Timer
- 30 Minute Timer
- 40 Minute Timer
- 45 Minute Timer
- 1 Hour Timer
- 2 Hour Timer
- All timers →
Each quick timer has its own page that starts counting the moment it opens — bookmark the ones you use every day. Need something different? Set a custom time above and press Copy link to save or share it.
Classroom tools for teachers
- Classroom TimerOne-tap presets for transitions, stations, tests, and clean-up.
- Visual TimerA shrinking disc with no numbers, for students who can't read a clock yet.
- Random Name PickerSpin a wheel to call on students fairly.
- Random Group GeneratorSplit your class list into balanced groups in one click.
- Dice RollerRoll up to six dice on the big screen.
- Flip a CoinHeads or tails with a running tally.
- StopwatchCount up with lap times, full screen.
- Pomodoro Timer25-minute focus sessions with one-tap breaks.
Classroom management guides
- How to Add a Timer to PowerPoint or Google SlidesFour ways to put a countdown timer in a presentation, from a 10-second browser trick to an animated bar, with step-by-step instructions.
- 9 Classroom Timer Strategies That Actually Save Instructional TimePractical ways to use a projected timer for pacing, transitions, and independent work without stressing students out.
- How to Run Classroom Transitions in Under Two MinutesA step-by-step routine for fast, calm transitions, with suggested timings for every grade band.
- Station Rotation Schedules: Timing Templates for 45, 60, and 90 MinutesReady-to-use rotation timings for three, four, and five stations, plus tips for grouping students.
See all resources for teachers →
A timer that stays out of the way
TeachTimer is a set of simple, fast timers you can put on a projector without worrying about what else shows up on screen. In full-screen mode the countdown is the only thing visible: no menus, no pop-ups, and no advertising.
- Accurate. Timers follow your device clock, so they don't drift when the tab is in the background.
- Readable from the back row. Digits scale to fill any display.
- Four ways to show time. Digital with a ring, a visual disc, a progress bar, or a traffic light.
- Keyboard and clicker friendly. Space starts and pauses, R resets, F toggles full screen, and a presentation remote works too.
Frequently asked questions
How do I set a timer?
Type the hours, minutes, and seconds under the timer and press "Set & start". For common lengths, pick a ready-made timer such as 5, 10, or 25 minutes and it starts the moment the page opens.
Can you set a timer for 10 minutes?
Yes. Open the 10 minute timer and the countdown starts right away, with an alarm when it reaches zero. There is a ready-made page for every common length from 10 seconds to 2 hours. Open the 10 minute timer
How much time is left on my timer?
The time remaining is shown in the large digits and in the browser tab title, so you can check it from another tab. While the timer runs, the line under it also shows the exact time it will end.
What is the difference between a timer and a stopwatch?
A timer counts down from a set length to zero and then sounds an alarm. A stopwatch counts up from zero to measure how long something takes. Open the stopwatch
How accurate is an online timer?
This timer reads your device clock instead of counting ticks, so it does not drift: it stays accurate to a fraction of a second even when the tab is in the background or the computer is busy.
How do I add a timer to PowerPoint or Google Slides?
The fastest way is to open a full-screen timer in your browser next to your slides and switch windows when you need it. You can also link to a timer from a slide or use a PowerPoint add-in. See the step-by-step guide
Is the timer free?
Yes. Every timer and classroom tool on this site is free to use, with no account and nothing to install.
Does it work on a smart board, Chromebook, or phone?
Yes. The timers run in any modern browser and scale to the screen, from a phone to a classroom projector. Press F for full screen.
Last reviewed by the TeachTimer team · How we build and check our tools