Stopwatch
Measure elapsed time with lap times, accurate to a hundredth of a second.
Runs entirely in your browser. Nothing you type is uploaded.
About this tool
Start, pause and reset a stopwatch and record lap times while it runs. Elapsed time is measured from a high-resolution timestamp, so pauses and background tabs do not accumulate drift.
Questions & answers
- Is it accurate enough for sports timing?
- It is accurate to about a hundredth of a second, but your reaction time on the button is far larger than that. For official results, use certified equipment.
- What does a lap record?
- Each lap stores both the split since the previous lap and the total elapsed time at that moment.
- Does this tool send my data to a server?
- Runs entirely in your browser. Nothing you type is uploaded.