Classroom Timer
Put a big, easy-to-read countdown on the board: a coloured ring that shrinks as time runs out, one-tap presets for common activities, and a gentle chime or school bell when time is up.
Quick presets
Keyboard: Space = start/pause, R = reset, F = full screen. The ring turns amber at 25% left and red at 10% left.
How to use the Classroom Timer
- Choose a time: tap a preset such as 5 min, or type minutes and seconds and press Apply.
- Add an activity name (optional) such as Group work so the class knows what the time is for.
- Pick an end sound: chime, school bell, beeps or no sound. Press Test sound to check the volume.
- Press Start and switch to Full screen for the projector. The ring shrinks and turns amber, then red, as the end approaches.
- Pause, add a minute or reset at any time. When the time is up the timer flashes and plays your sound.
Suggested timer lengths for classroom activities
| Activity | Typical time | Tip |
|---|---|---|
| Tidy up or transition | 1–2 min | Turn the end sound on so everyone hears when to sit down. |
| Think-pair-share | 2–3 min | Use 1 minute to think, then add time with +1 min for pairs. |
| Warm-up or do-now task | 5 min | Start the timer as students walk in. |
| Silent reading | 10–20 min | Choose No sound or the soft 1-minute alert. |
| Group work | 10–15 min | Show the activity name so groups stay on task. |
| Brain break | 2–5 min | Colour warnings help children wind down. |
| Timed test section | 15–45 min | Use full screen and turn the colour warnings on. |
When the colours change
The ring turns amber at 25% of the time remaining and red at 10%. That is:
| Timer | Amber from | Red from |
|---|---|---|
| 1 minute | 0:15 left | 0:06 left |
| 5 minutes | 1:15 left | 0:30 left |
| 10 minutes | 2:30 left | 1:00 left |
| 15 minutes | 3:45 left | 1:30 left |
| 20 minutes | 5:00 left | 2:00 left |
Tips for using timers with students
- Explain the colours once: green means keep working, amber means start finishing, red means wrap up.
- Be consistent: using the same sound for the same routine helps students respond quickly.
- Give a little extra: the +1 min button adds time without restarting, so you can extend an activity that is going well.
- Keep it calm: for focused work, choose the chime rather than the bell or beeps.
Frequently asked questions
Why use a visual timer in the classroom?
A shrinking ring lets students see at a glance how much time is left without needing to read a clock. It supports younger children, students with ADHD or autism, and anyone learning English, and it makes transitions between activities calmer and more predictable.
When does the timer change colour?
The ring is green for most of the time, turns amber when 25% of the time is left and red when 10% is left. For a 10-minute timer that is at 2 minutes 30 seconds and 1 minute. You can switch the colour warnings off.
Will the timer keep running if I switch tabs?
Yes. The timer is based on the system clock, so it stays accurate even if the browser slows down background tabs. The tab title also shows the time left.
Why can I not hear the end sound?
Browsers only allow sound after you interact with the page, which pressing Start does. Check that your device is not muted and use Test sound to hear it. Choose No sound for silent work.
Can I use the timer on a smart board or projector?
Yes. Press Full screen to fill the display. Press Esc or the Exit button to go back. On devices without full-screen support the timer fills the browser window instead.
What keyboard shortcuts are there?
Space starts or pauses the timer, R resets it and F toggles full screen.