Stopwatch with Lap Timer
Time an activity with a simple start/pause/reset stopwatch, and record lap splits along the way.
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What is Stopwatch with Lap Timer?
The Stopwatch with Lap Timer provides high-precision digital elapsed-time measurement with split lap tracking. By basing elapsed time on actual wall-clock timestamps rather than unthrottled interval ticks, it remains completely accurate even if your browser tab is backgrounded.
How to use Stopwatch with Lap Timer
- 1Click Start to begin counting elapsed time.
- 2Click Lap while running to record an intermediate split.
- 3Click Pause to halt timing, and Reset to clear all recorded laps and return to 00:00.00.
Key features
Centisecond Precision
Displays minutes, seconds, and hundredths of a second (centiseconds) in clear digital format.
Lap Split Recording
Record intermediate split times without pausing the ongoing master elapsed time.
Background Tab Accuracy
Calculates elapsed duration using real wall-clock timestamps (Date.now()) so timing remains completely accurate even if the tab is throttled.
Simple Controls
Responsive Start, Pause, Lap, and Reset controls designed for desktop and mobile devices.
Examples & use cases
Workout Lap Recording
Timing intervals with multiple laps
Start -> Lap at 45.20s -> Lap at 1m 30.10s -> Pause
Total elapsed time with split records for Lap 1 and Lap 2
Presentation Rehearsal
Measuring section duration during practice
Start presentation -> Lap after Introduction -> Lap after Core Demo
Timestamped split times for each presentation segment
Frequently asked questions
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