Stopwatch
Precision stopwatch with lap times — down to hundredths of a second.
The Stopwatch measures elapsed time with hundredth-second precision and tracks laps. Start, pause, take laps, reset — the essentials, nothing more, with a large tabular display that is easy to read mid-activity.
Use it for cooking timing, workout intervals, speech practice, puzzle solving, or any 'how long did that take' measurement. The lap list shows each lap's split time alongside the running cumulative total, so you can compare the second lap against the first at a glance, and copy the whole lap log to your clipboard.
The timer runs on requestAnimationFrame for smooth hundredth-second updates and keeps accurate accumulated time through pauses. Everything happens in the page — no account, no uploads.
00:00:00.00
How to use the Stopwatch
- Click Start to begin timing.
- Click Lap to record a split while the timer keeps running.
- Click Pause to stop, then Start to resume from where you paused.
- Reset clears the time and all laps.
- Copy the lap list with one button when you want a record.
Frequently asked questions
How precise is the stopwatch?
Displayed to hundredths of a second, with timing driven by the system clock rather than the animation frames — so displayed times track real elapsed time accurately even if frames drop.
What is a lap time?
A lap records the time since the previous lap (or the start for the first lap). The list shows each lap's split next to the cumulative total, letting you compare segment speeds.
Does the stopwatch keep running if I switch tabs?
The elapsed time is computed from the clock on resume, so the measured duration stays correct even if background rendering is throttled — an important property for a measurement tool.
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