Stopwatch
Times elapsed intervals with lap splits and exports the laps as a table.
Elapsed time with laps, where a lap records both numbers people want: the split since the previous lap and the running total. Time is measured as the difference between two clock readings, never as an accumulated tick count, so switching tabs mid-run does not make the watch lose seconds.
0:00.0
How to use it
Start, and press lap as you go
Each lap row shows the split and the cumulative total side by side; the fastest and slowest splits are marked.
Read the tenths
The display refreshes about every 60 ms because it shows tenths, and a slower repaint makes the last digit visibly stutter.
Copy the laps out
The lap list copies as a table, ready to paste into a spreadsheet.
Common questions
How accurate is it?
To the millisecond as far as the arithmetic goes, but what you see is limited by the display refresh and by your own reaction time on the button. Treat the tenths as real and the hundredths as decoration.
Do the laps survive a reload?
No. The stopwatch is deliberately session-only — copy the laps out before you leave the page.
Which number is the “lap time”?
Ambiguous everywhere, which is why both are shown. The split is the length of that lap; the total is the time from the start. Stopwatches that show only one are answering the wrong question half the time.
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Next
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