An online stopwatch with laps
Stopwatch mode is selected. Press Start, or Space, and Lap or L records each lap.
- Runs on your device
- No sign-up
- Works offline after a visit
| Lap | Lap time | Total |
|---|
Keys: Space starts or pauses, R resets, and L records a lap on the stopwatch.
This page opens the timer in Stopwatch mode, so the display starts at 00:00.00 and counts up. Each lap line shows the time since the previous lap, and the total is the time since the stopwatch started. Space starts and pauses it, R resets it, and L records a lap.
Laps suit repeated efforts, such as a set of runs or the same task done several times, because the lap column lets you compare them. Nothing is saved after you close the page, so copy the numbers before you leave. For a countdown instead, use the online timer.
How to set a countdown timer
- Pick a preset, or type hours, minutes and seconds, then press Start.
- Switch to Stopwatch for laps, and press Lap or L to record each one.
- Switch tabs if you like. The time stays right, and a tone sounds when a timer reaches zero.
Questions
How do I record a lap?
Press Lap, or press L while the stopwatch runs. Each press adds a line with the lap time and the running total, so you can record several laps in one session.
How do I read the display?
It shows minutes, seconds and hundredths of a second, so 01:23.45 is 1 minute, 23 seconds and 45 hundredths. Once an hour has passed, the hours appear at the front.
Why does the timer stay accurate when I switch tabs?
It reads the clock rather than counting ticks. When it starts, it saves the end time, and each update subtracts the current time from that. Browsers slow down timers in background tabs, so a counter that adds one per tick can drift. This one does not.
Will the sound play if the tab is in the background?
The tone is made in the browser and scheduled on the audio clock when the timer starts, so it sounds at the end time even if the tab is in the background. The page title shows the time left while it runs. Your device volume and mute settings still apply, and on phones the browser may stop sound when the screen locks, so keep the page open and the volume up.
Does the screen stay on while the timer runs?
Only if you tick the box, and only where the browser supports the Screen Wake Lock. The browser releases the lock when the tab is hidden, so the page asks again when you come back.
What do the lap times mean?
Each lap time is the time since the previous lap, and the total is the time since the stopwatch started. Reset clears the laps. Nothing is saved after you close the page.
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