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Online Countdown Timer
Set any time from a few seconds to 99 hours, press Start and the timer rings when it reaches zero. Tap a preset to start straight away.
Online Countdown Timer
The remaining time also shows in the browser tab, so you can switch tabs.
How to set the timer
- Type hours, minutes and seconds, or tap a preset such as 5 min.
- Press Start (or the space bar). Press again to pause.
- When the time is up an alarm plays three times and your phone vibrates if it supports it.
Press Test sound once first to check your volume — browsers only allow sound after you interact with the page.
Accurate in background tabs
Browsers slow down timers in tabs you are not looking at. This timer calculates the time left from your device clock and schedules the alarm on the audio clock when you press Start, so it finishes on time even if you switch tabs or apps. The tab title shows the countdown, so you can glance at it from any tab.
Ideas for using a countdown
- Cooking and baking stages
- Exam and quiz practice
- Classroom activities and presentations
- Workouts, intervals and rest periods
- Time-boxing tasks and meetings
Popular timer lengths
| Length | Good for |
|---|---|
| 1 minute | A one-minute plank or wall-sit hold |
| 2 minutes | Brushing teeth for the full recommended two minutes |
| 3 minutes | Steeping black tea such as Assam or English breakfast |
| 5 minutes | The "five-minute rule": start a task you are avoiding and stop after five minutes if you still want to |
| 10 minutes | A ten-minute guided meditation or body scan |
| 15 minutes | A coffee or tea break at work |
| 20 minutes | A 20-minute power nap that avoids deep-sleep grogginess |
| 25 minutes | A single Pomodoro focus session |
| 30 minutes | A 30-minute workout, jog or yoga session |
| 45 minutes | A school period or tutoring session |
| 1 hour | Timed one-hour practice exams |
Frequently asked questions
Why did the alarm not play?
Browsers block sound until you interact with a page. Press Start yourself (not via a shared link alone) and make sure your device is not muted.
Can I run the timer full screen?
Yes — use the full-screen button for large digits on a classroom projector or TV.
What is the longest time I can set?
Up to 99 hours, 59 minutes and 59 seconds.