Prepare a fresh measurement
Input and settings
Reset to stopped, zero elapsed time, no laps
Expected result
00:00:00.00 and no laps. Start manually.
Stopwatch
A simple stopwatch with start, pause, resume, lap, and reset controls.
How to use
These are example steps; replace the values for your task.
- Start timing and pause for a break.
- Press Start / Resume when returning to work.
Enter values
Result
Laps
About this tool
Elapsed time is calculated from timestamps rather than the number of display updates, reducing drift after the tab returns from the background.
Reloading the page clears the timer and laps. Use a dedicated timer as a backup for critical long-running measurements.
Try a use case and check the result
Use a short demonstration to distinguish elapsed time from cumulative laps.
Example buttons replace the inputs and settings above and calculate. Restore previous input steps back one example at a time. After trying multiple examples, repeat restore to return to your original input. This history is lost when the page closes.
Try Start → Lap → Pause
Input and settings
Reset, then Start, Lap and Pause in order
Expected result
One lap, stopped. Time reflects actual execution and can be 0.00 seconds.
How to read the result
Laps are cumulative from the start, not differences from the previous lap. Lap while paused adds nothing. Resume adds to the earlier elapsed time and excludes the pause.
Scope and limits
Pause before applying/restoring examples. Restore includes elapsed time and all laps. A hundredth-of-a-second display is not certified sports timing. Reload loses the measurement.
Controlled timestamps verify 10 seconds running plus 5 seconds after resuming equals 15 seconds. Real browsers check lap count, stable paused display and restoration of existing laps.
Continue with the next task
Measure active work excluding a pause
After 10 seconds of timing, pause; timing for another 5 seconds after resuming gives 15 seconds total.
Elapsed time before the pause is retained and the timestamp difference after resuming is added.
Laps show cumulative elapsed time, not individual segment duration. Pressing Lap while paused adds no entry.
Frequently asked questions
Does it keep running in the background?
The display may pause, but elapsed time is corrected from timestamps when you return.
Are laps saved?
No. Laps exist only while the page remains open.
Is the hundredth-of-a-second display official timing?
No. It is a browser-based estimate, not a certified sports timer.
Related tools
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Share only the tool name and public URL. Your input and results are not included.
Inputs and storage
Keep any content you need before clearing. This tool does not autosave inputs or results. Reloading or closing the page, clearing inputs or resetting may discard your work.
Favorites and language preferences are stored separately and may be lost when site data is cleared. Tool resets and site-data deletion do not delete files already downloaded to your device.