Online Stopwatch to the Hundredth
Start with one key, record your laps, and compare them at a glance: the best and worst lap are highlighted. Handy for sport, revision, or a physics experiment.
- 1/100 s precision
- Lap times
- Keyboard shortcuts
- No installation
100% private — Everything is processed directly in your browser: your files, voice, and image are never sent to Chatzam's servers.
How to use the stopwatch?
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Start
Click “Start” or press the Space bar. Press again to pause, then resume whenever you want.
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Record laps
Press “Lap” or the L key at each pass: the lap time and the gap from the previous one appear.
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Analyze and export
Spot the best and worst lap, copy or export the list of times, then reset with the R key.
A stopwatch built to actually measure
To the hundredth of a second
A precise display down to the hundredth, readable in large size and full screen.
Laps compared
Each lap time shows the gap from the previous lap; the best and worst lap stand out in color.
By keyboard
Space to start or stop, L for a lap, R to reset: your eyes stay on the action, not on the mouse.
Exportable times
Copy your laps to paste them into a spreadsheet, a training log, or a lab report.
Time your laps and sets during training
Track running, interval training, swimming lengths, circuit training: press L at each pass and the stopwatch records each lap's time along with the gap from the previous one. You immediately see if you're speeding up or slowing down, and the best and worst lap are highlighted. At the end of the session, copy the list of times to track your progress week after week.
Measure a precise time: a talk, an experiment, a game
Rehearsing a talk or a speech within a set time, measuring the duration of a fall or a reaction in a physics class, testing a speedrun, settling a tie in a quiz: a stopwatch precise to the hundredth of a second covers most needs. Full-screen mode lets you project it for a class or an audience, and the keyboard shortcuts save you from hunting for the button at the crucial moment.
Stopwatch or timer: which one should you use?
The stopwatch counts up from zero: it measures how long an action takes. If instead you want to be alerted after a set duration (cooking, Pomodoro, a break), use our “Online Timer” with alarm. And to show the time left before a specific event, our “Countdown Timer”.
Frequently Asked Questions
How precise is the stopwatch?
It displays time to the hundredth of a second. For manual timing, the real limit remains the reaction time of the person pressing the button.
How do I record a lap time?
Press the “Lap” button or the L key while the stopwatch is running. The lap time and the gap from the previous one are added to the list.
What are the keyboard shortcuts?
Space to start, pause, or resume, L to record a lap, R to reset.
Can I get the list of my laps?
Yes, copy or export the times in one click to paste them into a spreadsheet, a note, or a message.
Does the stopwatch work on a phone?
Yes, in your smartphone's or tablet's browser, with no app or account.