How to use the online stopwatch
The stopwatch measures elapsed time without any hardware beyond the device you are already holding. Intervals at training, something on the stove, a task you want to time honestly — the process is the same.
Getting started
- Press Start when you begin
- Press Lap to record a split without stopping
- Press Stop to finish, Reset to clear
Main features
- Start and stop with a single click
- Reset the stopwatch to zero
- Record laps for interval work
- Time study or work sessions
- Keep talks and presentations to length
Getting more out of it
- Keep the tab open while timing — the clock runs in the browser
- Use full screen when the display needs to be readable from a distance
- Bookmark this page so it is one tap away next time
- Use laps rather than restarting when you need several intervals in a row
That is the whole tool — no settings to learn, nothing to configure.
A stopwatch measures how long something takes as it happens, rather than counting down to a target, which makes it the right tool when you don't know the duration in advance. Press start, and the display runs up from zero in hours, minutes, seconds and hundredths, ready to stop or reset the moment you need a reading.
It's built for the same kinds of moments a physical stopwatch always covered: timing a training run, checking how long a phone call actually lasted, or seeing how quickly a task gets done compared with last time. Because it lives in a browser tab, there's nothing to find, charge or carry — it's already open if you're at a computer.
What it can do
- Start, stop and reset with a single click, no menus in the way
- Record lap times without stopping the overall count, useful for intervals
- Display results precisely enough for casual sport, cooking or study timing
- Run for extended periods without needing to be reset
Worth knowing honestly: browser-based timing depends on your device and tab staying active, and JavaScript timers can drift by small fractions of a second over very long runs. For everyday use — training laps, cooking, timing a presentation rehearsal — that drift is far too small to notice. For laboratory-grade precision or official athletic timing, dedicated hardware is still the better tool.
Switching tabs briefly won't stop the count, though heavily throttled background tabs in some browsers can slow the display's updates slightly until you switch back. Keeping the stopwatch tab visible avoids that altogether.
Common questions
How accurate is an online stopwatch?
Accurate enough for everyday timing like workouts or cooking, with only minor drift possible over very long sessions — not precise enough for official athletic or laboratory timing.
Can I record lap times without resetting the stopwatch?
Yes, the lap function records a split while the overall stopwatch keeps running, so you can track multiple intervals in one session.
Does the stopwatch keep counting if I switch to a different tab?
Generally yes, though some browsers slow down inactive tabs slightly, which can make the display update less smoothly until you switch back.
Is there a maximum time the stopwatch can run for?
No practical limit for normal use — it will keep counting through hours if needed, though most uses only need minutes.
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