Measure elapsed time with millisecond precision. Start, stop, and reset for accurate time tracking of any duration.
Stopwatch
00:00:00.000
How it works
Uses requestAnimationFrame for smooth, accurate timing. Lap times show split from start and total elapsed time. Millisecond precision for accurate measurements.
Methodology and approach
The stopwatch tracks elapsed time by accumulating millisecond intervals between start and stop events.
Enter dates in the format shown by this tool. Date-only calculations use calendar dates; date-time fields use local time unless a timezone selector is provided. Timestamp outputs identify their units.
Common questions about this tool
