Stopwatch
A simple, accurate online stopwatch. Record laps, go fullscreen, control it from your keyboard and export your lap times to CSV.
| Lap | Lap time | Total time | |
|---|---|---|---|
| Laps you record will appear here. | |||
How to use the Stopwatch
- Press Start (or the Space bar) to start timing.
- Press Lap (or L) to record a lap. Each row shows the lap time and the total time.
- Press Pause to stop the clock, and Start to carry on. Reset (or R) clears the time and laps.
- Go fullscreen with the ⛶ button or F, ideal for classes, workouts and presentations.
- Export your laps as a CSV file for Excel or Google Sheets, or copy them as text.
Keyboard shortcuts
| Key | Action |
|---|---|
| Space | Start, pause and resume |
| L | Record a lap (while running) |
| R | Reset the time and clear all laps |
| F | Fullscreen on or off |
Popular uses
- Running and swimming: record a lap at each split and compare your fastest and slowest laps.
- Workouts: time planks, sets and rest periods. Fullscreen makes the time easy to read from across the room.
- Classrooms and meetings: time activities, speeches and presentations on a projector.
- Work and study: track how long tasks take and export the laps to a spreadsheet.
Need to count down instead? Use the countdown timer with an alarm.
Frequently asked questions
How accurate is this online stopwatch?
It uses your browser's high-resolution clock, which is accurate to well under a millisecond. The display updates about 60 times a second. Background tabs may update the display less often, but the measured time stays correct.
What is the difference between lap time and total time?
Lap time (also called split) is the time since the previous lap. Total time is the time since you started the stopwatch.
Will the stopwatch keep running if I close the tab?
The start time is saved in your browser, so if you reload the page or come back later, the stopwatch shows the correct elapsed time and keeps running.
What are the keyboard shortcuts?
Space starts and pauses, L records a lap, R resets and F toggles fullscreen.
Can I export my lap times?
Yes. Press Export CSV to download a spreadsheet with lap number, lap time and total time, or Copy laps to paste them anywhere.