Online Stopwatch
A simple, accurate stopwatch with lap times. Works on phone and desktop, full screen included.
Keyboard: Space start/stop · L lap · R reset
| Lap | Split | Total |
|---|
How the stopwatch works
The stopwatch counts up in minutes, seconds and hundredths. Use the keyboard Space bar if you are on a computer.
Press Lap at each checkpoint. You get the split for that lap and the running total, and the fastest and slowest laps are highlighted.
Press Stop to pause and Start to continue. Reset clears the time and the laps. Full screen makes the digits large enough to read across a room.
Counting down instead? Use the countdown timer, which can also count down to a date in any time zone.
What people use a stopwatch for
- Running and swimming: time each lap or interval and compare your splits.
- Studying and work: time focused sessions and see how long a task really takes.
- Cooking and experiments: time steps that need an exact duration.
- Presentations and games: check how long each speaker or round lasts.
Frequently asked questions
How accurate is this online stopwatch?
It measures time with your browser's high-resolution clock and shows hundredths of a second. It keeps counting correctly even if you switch tabs or your screen dims, because it works from the start time and not from counting ticks. Very brief delays can come from the device itself, so for official sports timing use certified equipment.
How do I record lap times?
Press Lap while the stopwatch runs. Each lap shows its own split time (the time since the previous lap) and the total time. The fastest split is shown in green and the slowest in red once you have three or more laps.
What is the difference between lap time and split time?
People use the terms differently. Here, the lap (split) column is the time of that single lap, and the total column is the time since you pressed Start. Together they cover both meanings.
Does it keep running if I close the tab or lock my phone?
It keeps running while the page stays open, even in the background or with the screen locked on most phones. If you close the tab or leave the page, the time is lost, so keep it open until you have noted your result.
Can I use the keyboard?
Yes. Press Space to start or stop, L to record a lap and R to reset.
Is it free, and is my data stored?
It is free with no sign-up. Nothing you time is stored or sent to our server; it all stays in your browser.