What a classroom timer is good for
Each suggestion opens in a space with a matching scene and alarm.
How to use the classroom timer
- Press StartThe 5 minute countdown begins at once. The Space bar starts and pauses it too; R resets it.
- Adjust as you goUse − and + to change it by 1 minute, or click the digits and type any time, like 12:30, 1h30 or until 5:30pm.
- Hear the alarmA gentle chime rings at zero until you press Stop, and the screen floods sunrise-warm. Choose a bell, a loud alarm or a silent glow for tests under More.
- Make it yoursPick a scene and sound, press Fullscreen for a room-sized Clear view (Esc to exit), turn on notifications for a background tab, or add
?autostart=1to the link to start on load.
Shortcuts
Single-key shortcuts can be switched off under More.
Classroom timer at a glance
| Accuracy | Counts to an absolute finish time, so it stays exact in a background tab and after the device sleeps. How the timing is tested |
|---|---|
| Alarm | Gentle chime that rings until you press Stop, with the whole screen flooding sunrise-warm. A bell, a loud alarm or a silent glow for tests under More. |
| Display | Large digits that never jitter, a progress horizon, and a fullscreen Clear view (or Daylight, for bright rooms) readable across a room. |
| Sound | Optional rain, ocean, fireplace, café, night, brown or white noise and a focus pad — made in your browser, faded out at zero. |
| Memory | A running or paused countdown survives a reload or a browser restart, saved on this device only. |
| Price | Free. No ads, no signup, nothing to install — and it works offline once visited. |
Visual classroom timers
A picture of the time left, for pupils who can’t read a clock yet. All ten live in the Classroom Timers hub, with Think–Pair–Share, stations and a lesson agenda that run as steps.
Classroom activity timers: stations, Think–Pair–Share, lesson agenda →
Other ways to time with a classroom timer
The same countdown as a picture, a soundscape, a projector view or a video.
About the classroom timer
Use this classroom timer on a projector, smart board, interactive whiteboard, tablet, or shared classroom screen. Switch to fullscreen for a large visual countdown the whole room can see, start with 5 minutes, edit the time directly, or jump to common lesson durations like a 10 minute classroom timer. For a picture instead of digits — sand draining, a candle burning down, a traffic light, a race — open the classroom timers hub.
Free classroom timer for teachers, lessons, transitions, quizzes, reading time, and group activities. A large visual countdown for projectors, smart boards, and classroom screens with a sound alarm and quick duration links.
TimerHub calculates remaining time from an absolute finish timestamp, so missed browser callbacks do not create drift. Read the timing accuracy methodology and reproducible tests.