5:00
5 minutes
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Space Start / Pause · R Reset · F Fullscreen
A clean, distraction-free countdown timer designed for classroom use. No ads, no account, no install. Works on any browser, Chromebook, iPad, or interactive whiteboard. Press F for fullscreen mode — large digits visible from any seat in the classroom.
Research published in Applied Cognitive Psychology and reviewed by educational psychologists consistently shows that visible time constraints improve student focus and task completion. Students who can see how much time remains show 23% higher on-task behaviour compared to verbal-only time warnings. A classroom timer also reduces transition anxiety — students know exactly how long they have, reducing the "is time almost up?" interruptions that break instructional flow.
Display the remaining time on the projector. Students manage their pace without asking repeatedly. Use the amber warning as a visual cue to start wrapping up.
Set 15–20 minutes for group activities. The visible countdown creates shared urgency and keeps groups on task without teacher intervention.
1–2 minutes for packing up, moving to new seats, or switching activities. Removes the ambiguity of "you have a minute" — the clock proves it.
Evidence-based timing for common classroom activity types. Click any to set the timer above.
| Activity | Recommended time | Notes |
|---|---|---|
| Exit ticket / quick reflection | 3–5 minutes | Students need enough time to think and write one substantive response |
| Think-Pair-Share | 2 minutes total | 30 sec think, 90 sec share — visible timer prevents one partner dominating |
| Independent reading | 10–20 minutes | Research shows reading focus drops after 20 minutes without a break |
| Group project work | 15–25 minutes | Long enough for meaningful progress; timer prevents scope creep |
| Classroom transitions | 1–2 minutes | Explicit countdown prevents dragging; amber warning signals final 20% |
| Standardised test section | 25–45 minutes | Match to your test format; fullscreen mode keeps focus on the clock |
| Presentations per group | 3–5 minutes | Fair across all groups; timer visible to presenter prevents overrunning |
Set up in under 10 seconds. No account, no app, no configuration needed.
Open this page on the device connected to your projector or interactive whiteboard. Works on any browser.
Click a quick-set button or type a custom time. Durations from 1 minute to 45 minutes pre-loaded above.
Press F or click Fullscreen. The timer fills the entire display — large enough to read from any seat.
Space bar or Start button. Ring turns amber in the final 20% of time, then alarm sounds at zero.
Yes, completely free. No account, no subscription, no ads, no popups. It works in any browser on any device including Chromebooks, iPads, interactive whiteboards, and Windows or Mac computers.
Research in applied cognitive psychology shows that students with a visible time countdown show significantly higher on-task behaviour compared to verbal time warnings alone. Visible timers also reduce transition anxiety and the constant questions of 'how long do we have?' — students can see the answer themselves.
Open this page in Chrome or Edge on your whiteboard computer. Set your duration, then press F or click Fullscreen. The timer expands to fill the entire screen. The ring changes colour as time runs low — amber in the final 20%, green when complete.
Yes. Chromebooks are fully supported. Open the page in Chrome, press F11 for browser fullscreen if needed, then press F or use the fullscreen button in the timer. No extensions or apps required.
Yes, in fullscreen mode. The digits and ring are large enough to be visible from 10–15 metres. The colour-coded ring provides a visual cue even for students who cannot read the digits clearly.
The ring turns green visually when time expires. For audio, ensure your device volume is turned up before starting. The alarm plays three distinct beeps using the browser audio API — it will sound on most devices unless muted at the system level.
Yes. Click Customise in the top-right corner to change the background theme (light, dark, slate, forest, and more), ring colour, and pattern. Your settings are not saved between sessions, so configure before class.
Once the page has loaded, the timer runs entirely offline using only the browser. There are no external scripts or analytics. This makes it reliable in schools with filtered internet connections.