Stopwatch with laps
Measure elapsed time and record laps with separate lap and cumulative times. The display shows hundredths of a second; display resolution is not a guarantee of timing accuracy.
How to use
Start, record a Lap while running, then Stop. Resume continues the total. Reset clears the elapsed time and laps. Fastest and slowest labels supplement their colors.
Questions and answers
Will changing the system clock change a lap?
The stopwatch uses performance.now(), a monotonic browser clock, so ordinary system-clock adjustments do not change elapsed time. Sleep behavior varies by browser and operating system; page reload clears results. It is unsuitable for certified measurements.
Checks and limits
Checked: start/stop/resume, two cumulative laps, fastest/slowest labels, a simulated system-clock jump, and reset to 00:00:00.00.
Automated Chromium checks covered working controls, invalid input, reset and mobile layout. This does not certify every browser, physical device or linguistic nuance.
Technical references
Related tools
Maintained by GadgetsFocus. Updated October 2, 2026. Implementation and translations were reviewed with AI assistance; no independent native-speaker review is recorded.