A full-screen online stopwatch with laps, and a countdown timer with an alarm.
Runs entirely in your browser — no sign-up, no ads in the way.
What is an online stopwatch and timer?
It is a free browser-based stopwatch and countdown timer needing no sign-up. The stopwatch counts up with hundredths of a second and stores laps as you record them, while the timer counts down and sounds a short beep when it reaches zero. Use the stopwatch to time events and laps, or switch to the timer to count down with an alarm.
Understanding your result
The stopwatch counts up with hundredths of a second and stores laps; the timer counts down and sounds a short beep when it reaches zero.
Assumptions and limitations
Timing accuracy depends on your device and browser, so this is not a certified sports timer. If the tab is inactive or your device sleeps, the alarm may be delayed or muted, and background timing can drift. For official results or safety-critical timing, use dedicated hardware rather than a browser tool.
How to use this tool
- Choose Stopwatch or Timer at the top.
- For the timer, set minutes and seconds.
- Press Start; use Lap (stopwatch) or Reset any time.
About the Stopwatch & Timer
A simple, accurate online Stopwatch & Timer. Use the stopwatch to time events and record laps, or switch to the timer to count down with an alarm when time’s up.
Who should use this tool
Athletes, coaches, cooks, teachers and anyone timing intervals, workouts or focused work sessions. The lap function suits runners and circuit training, while the countdown timer with an alarm helps with cooking, presentations, exams and short breaks.
Benefits
- Counts up to hundredths of a second with lap recording
- Switches to a countdown timer with an alarm
- Full-screen display is easy to read from a distance
- Runs in the browser with nothing to install
Practical use cases
- Timing laps during a run or swim
- Running countdowns for cooking or baking
- Keeping a talk or presentation to time
- Timing focused work and short breaks
Explore all Productivity tools
Frequently asked questions
Will the alarm sound if I switch tabs?
The countdown keeps running, and the beep plays when you return if the browser paused background audio. Keep the tab active for the most reliable alarm.
How accurate is the stopwatch?
It is accurate enough for training, cooking and everyday timing, showing hundredths of a second. Because it relies on your device's clock and browser, tiny variations are possible and it is not a certified competition timer. For official race results, use approved timing equipment instead.
Can I record multiple laps?
Yes. While the stopwatch runs you can capture laps, each recording the time since the previous one, which is useful for repeated efforts such as running intervals or circuit stations. The laps stay listed on screen so you can compare them once you stop.