Classroom Timer
Free online classroom timer for lessons, transitions, quizzes, and group work.
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.
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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.
Common Uses
- Warm-up activities
- Station rotations
- Timed quizzes
- Silent reading
- Group work transitions
- Projector and smart board countdowns
How to Use the Classroom Timer
- Press Start — or the Space bar — to run the 5 minute countdown. Space also pauses and resumes it; R resets it
- Adjust by 1 minute with the +/- buttons while it runs, toggle Repeat to loop it, and check the finish time shown under the display
- Use the Fullscreen control below the timer for a room-sized countdown (Esc to exit)
- Choose or mute the alarm in the header's sound settings, and pick a background sound — rain, ocean, fireplace or brown noise — that fades out at zero
- Enable notifications to be alerted when your classroom timer finishes in a background tab, and add
?autostart=1to the link to start the countdown on load
Frequently Asked Questions
Can I use this classroom timer on a projector?
Yes. Open TimerHub on the classroom computer or tablet, set the time, and use fullscreen mode for a large countdown students can see across the room.
What classroom timer length should I start with?
Five minutes works well for warm-ups and transitions. Use 10 to 20 minutes for group work, quizzes, silent reading, or station rotations.
Does the classroom timer have sound?
Yes. The timer plays an alarm when time is up, and you can mute sounds from the header if you only want a visual countdown.