Countdown Timer
The Countdown Timer counts down from a specified time to zero. Set hours, minutes, and seconds, then start the countdown. The timer alerts you when it reaches zero. This tool is useful for presentations, cooking, exercise intervals, games, and any time-based activity. It runs in your browser tab and continues even if you switch to other applications.
Formula
Countdown logic: - Set: hours, minutes, seconds - Start: begins countdown - Pause: stops temporarily - Reset: returns to original time - Alert: sound/visual at zero Display: HH:MM:SS format
Example
Set: 10 minutes Start: 10:00 After 3 minutes: 7:00 After 10 minutes: 0:00 (alert) Common uses: - 25 min: Pomodoro work - 5 min: Break timer - 30 min: Presentation timer
How to Use
- Set hours, minutes, and seconds
- Click start to begin the countdown
- Optionally pause and resume
- The timer alerts you when it reaches zero
- Click reset to return to the original time
Frequently Asked Questions
Does the timer work when I close the tab?
No. The timer runs in the browser tab. If you close the tab or browser, the timer stops. Keep the tab open for the timer to continue. Some browsers throttle background timers, which may cause slight delays.
Can I set multiple timers?
The tool supports one active timer at a time. For multiple simultaneous timers, open multiple browser tabs. Each tab can run its own countdown timer independently.
Will the timer alert me when it finishes?
Yes. When the countdown reaches zero, the timer plays a sound alert and shows a visual notification. Make sure your browser allows sound and notifications for the page. You can also enable browser notifications for alerts even when the tab is in the background.
Can I use the timer for Pomodoro?
Yes. Set the timer to 25 minutes for work sessions and 5 minutes for breaks. For a full Pomodoro experience with automatic work/break cycles, use the dedicated Pomodoro Timer tool.
How accurate is the timer?
The timer uses JavaScript's setInterval, which is accurate to within a few milliseconds per minute. For most uses, the accuracy is sufficient. For very precise timing (scientific, sports), use a dedicated stopwatch or timing device.