Stopwatch
Online stopwatch
00:00.00
Tap Start to begin counting and Lap to record splits. Timing is accurate to the millisecond and keeps going even if you switch tabs.
Laps
| No. | Lap | Total | Difference |
|---|
How to use the online stopwatch
Tap Start to begin. Pause freezes the count and Resume picks up where it left off. Reset sets everything back to zero and clears the laps.
While the stopwatch is running, tap Lap to record a split. The table shows each lap time, the running total and the difference from the previous lap. The best and worst laps are labeled.
Time is measured with the browser’s high-precision clock (performance.now), which doesn’t drift. If you switch tabs or reload the page, the count stays right.
Keyboard shortcuts: Space starts and pauses, L records a lap and R resets.
Frequently asked questions
Does the stopwatch keep counting if I switch tabs?
Yes. The count is calculated from the difference between the start time and now, not by adding up "ticks". Even if the browser slows down the background tab, you’ll see the correct time when you come back.
How accurate is the stopwatch?
Time is measured in milliseconds with the browser’s high-resolution clock. The display shows hundredths. Real-world accuracy also depends on your reaction time when tapping the buttons.
How do I see the best and worst lap?
From the second lap on, the table labels the best (fastest) and worst (slowest) laps. The Difference column shows how much faster or slower each lap was than the previous one.
If I close the page, do I lose the time?
No, if you come back in the same browser: the stopwatch and laps are saved and continue where they were. In a private window they’re lost when you close it.