Countdown Timer
Set a time and start a countdown.
Input Information
Result
Set Duration: 00:05:00
Set a time and manage it efficiently with a countdown!
A countdown timer is a practical tool that counts down a set amount of time and visually shows the progress. It's useful for exercise, studying, cooking, presentations, and more.
You can freely set time in hours, minutes, and seconds, and the progress bar shows status intuitively. When less than 10 seconds remain, the color changes for a tense finish.
Useful for Pomodoro technique, interval training, cooking timing, presentation time management, and any situation where time matters.
Terminology
- D-day
- A countdown concept that counts the remaining days until an important target date, using that date as the reference point (day 0).
- 1
Set time
Enter hours, minutes, and seconds. E.g., 5-min timer → 0h, 5m, 0s.
- 2
Click start
Press start to begin countdown. Click the page once first to enable audio.
- 3
Monitor progress
Watch remaining time and the progress bar update in real time.
- 4
Pause and resume
Pause to stop, then resume to continue from where you left off.
Example 1 — 5-minute timer (cooking/exercise)
Set 0h 5m 0s = 300 seconds total. At 1 min elapsed: 20%; at 3 min: 60%. Alarm sounds at 0. Ideal for egg timing, interval training, etc.
Example 2 — 25-minute Pomodoro timer
Set 0h 25m 0s. Pomodoro: 25 min focus + 5 min break. Set this timer for 25 min, then reset for 5 min — a complete Pomodoro cycle.
Timer Operation
Decreases remaining time by 1 every second using setInterval. When it reaches 0, the timer stops and an alarm sounds.
Alarm Sound Generation
Uses Web Audio API Oscillator to generate alarm sounds by adjusting frequency and duration, without needing audio files.
Progress Calculation
Progress(%) = (Set Duration - Remaining Time) / Set Duration × 100
Timer Usage Tips
- Pomodoro Technique: 25 minutes of focus followed by 5 minutes of rest, with a longer 15-30 minute break after 4 sets.
- Interval Training: Precise time management for plank, burpees, squats, and other time-based exercises.
- Cooking Timing: Convenient for accurately timing pasta boiling, oven cooking, and more.
- Presentation Time Management: Setting a timer helps maintain a systematic flow during presentations.
- Quiz/Games: Creates tense time limits for quiz shows, puzzle games, and more.
- Meditation/Yoga: Helps accurately time and maintain consistent meditation practice.
QDoes the timer keep running if I switch tabs?
Most modern browsers throttle setInterval in background tabs, potentially delaying the alarm by several seconds. For time-critical uses (e.g., exam timing), keep this tab focused or use a phone timer as backup.
QWhat if the alarm doesn't sound?
The alarm uses Web Audio API and may be blocked by autoplay policies. Click the page or press a key before starting the timer. Also check OS mute and the tab's audio icon.
QWhat is the maximum timer duration?
Hours, minutes, and seconds are set independently, so up to 23h 59m 59s is possible. For longer durations, use multiple timers or a phone alarm.
QHow is the progress bar calculated?
Progress = (elapsed time ÷ total time) × 100%. It starts at 0% and reaches 100% when the alarm triggers; remaining time counts down in real time.
QCan I run multiple timers simultaneously?
This tool supports one timer. Open multiple tabs for simultaneous timers. Stagger their durations so alarms don't overlap for easier identification.