UtilityBaseProductivity Tools
Stopwatch
A precise online stopwatch with lap times — keeps counting in background tabs.
Updated February 24, 2026
How to use the stopwatch
- 1Press Start (or Space) to begin timing.
- 2Press Lap (or L) to record splits without stopping.
- 3Press Stop (or Space) to pause, and Reset (or R) to clear.
Common uses
- Time workout intervals with lap splits.
- Measure how long tasks actually take.
- Time experiments, speeches, and games.
Frequently asked questions
Does the stopwatch stay accurate if I switch tabs?
Yes. Elapsed time is calculated from the real start timestamp, so even if the browser slows down the display in a background tab, the time shown when you return is exact.
What's the difference between lap time and split time?
The split is total elapsed time when you pressed Lap; the lap time is the duration since the previous lap. The lap list shows both.
What are the keyboard shortcuts?
Space starts and stops, L records a lap while running, and R resets when stopped.
How precise is it?
The display updates with centisecond (0.01s) resolution and the underlying measurement uses the browser's high-resolution clock, which is more than sufficient for manual timing.
About this tool
The stopwatch measures elapsed time with centisecond precision and records lap times with per-lap splits, so you can time intervals within a longer session. Because it computes elapsed time from real timestamps rather than counting ticks, it stays accurate even when the tab is in the background. Keyboard shortcuts (Space to start/stop, L for lap, R for reset) make it usable without looking away from what you're timing.
Like everything on UtilityBase, the stopwatch runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more productivity tools here.
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