ToolFeather

Online Stopwatch

Time anything with start, stop, lap and reset controls, accurate to a hundredth of a second.

Stopwatch

00:00.00
#LapTotal

🔒 Nothing you enter is sent anywhere or stored. All processing happens in your browser.

How it works

Press Start to begin timing and the display updates continuously, showing minutes, seconds and centiseconds (hundredths of a second). Pressing the same button again stops the clock while keeping the elapsed time, so you can start and stop as many times as you need without losing the running total.

Lap records a split: the table shows the time for that individual lap alongside the cumulative total, with the newest lap at the top. This is perfect for comparing repeated efforts — running intervals, sets in a workout, or steps in a process. Reset clears the clock and every recorded lap back to zero.

The stopwatch uses your browser's animation frame for a smooth, accurate display and cleans itself up when stopped, so it won't drain your battery in the background. Nothing is recorded or uploaded — it runs entirely on your device.

Examples

Running intervals → press Lap each 400 m to compare split times.
Timing a presentation rehearsal → Start, then Stop at the end.
Cooking steps → lap each stage to see how long each one really takes.

Frequently asked questions

How precise is the stopwatch?
It displays hundredths of a second. Real-world accuracy depends on your reaction time when pressing the buttons, but the underlying clock is precise to the millisecond.
What's the difference between a lap and the total?
The lap column shows the time since your previous lap, while the total column shows the full elapsed time from when you started.
Can I start and stop repeatedly?
Yes. Stopping pauses the clock and keeps the current time; starting again continues from there, so you can accumulate time across several intervals.
Are my lap times saved after I close the page?
No. Times exist only while the page is open and are cleared on Reset or when you leave, so nothing is stored or uploaded.
Will it keep running if I switch tabs?
The elapsed time stays correct because it is based on real timestamps, though the on-screen display may pause updating until the tab is active again.