Stopwatch
Precise centisecond stopwatch with lap times. Track splits, highlight best and worst laps, and copy results.
00:00:00.00
No laps recorded yet
Free Online Stopwatch with Lap Times
Zolkit's stopwatch measures elapsed time to centisecond precision, updating 10 times per second for smooth, accurate readings. Record lap times with a single click — each lap shows the split duration alongside the cumulative total. Best and worst laps are automatically highlighted in green and red so you can spot performance outliers at a glance. Copy all results to the clipboard in a clean tabular format for pasting into a spreadsheet or sharing with your team.
Centisecond Precision
Displays HH:MM:SS.cc with 10 updates per second. Accurate enough for sports timing, interval training, and performance benchmarking.
Instant Lap Recording
Press Lap at any point to record a split. Each entry shows the lap duration and the running total without interrupting the clock.
Best & Worst Lap Highlights
The fastest lap is highlighted green, the slowest red. Instantly identify outliers in a long training session.
Copy Results
Export all lap data to your clipboard with one click. Paste into Google Sheets, Excel, or any text editor.
Works Offline
The stopwatch runs entirely in your browser. No network requests, no server dependency — use it anywhere.
Mobile Friendly
Large tap targets and a responsive layout make it easy to start, stop, and record laps on a smartphone one-handed.
How to Use the Stopwatch
- 1
Click Start to begin timing. The display updates 10 times per second for smooth centisecond readouts.
- 2
Press Lap while the stopwatch is running to record a split time. Each lap shows the interval duration and the cumulative elapsed time.
- 3
Click Stop to pause timing, then Start again to resume. Press Reset to clear the stopwatch and all recorded laps.
Frequently Asked Questions
How accurate is this stopwatch?
The stopwatch uses JavaScript's performance.now() API when available, falling back to Date.now(). It is accurate to within a few milliseconds — sufficient for athletic timing, cooking, and general use. For lab-grade precision, dedicated hardware instruments are required.
Can I record laps without stopping the timer?
Yes. The Lap button records a split time while the main clock continues running. The stopwatch never pauses when you press Lap.
How many laps can I record?
There is no hard limit. The lap list scrolls vertically, so you can record as many splits as needed. All laps remain visible until you press Reset.
How do I export the lap times?
Click the 'Copy Results' button after recording laps. The data is copied to your clipboard in a tab-separated format: Lap number, Lap time, and Total time. Paste directly into a spreadsheet.
Does the stopwatch continue if I switch tabs?
Yes. The stopwatch tracks elapsed time based on the system clock, so switching tabs or minimizing the browser does not affect accuracy. When you return, the display reflects the correct elapsed time.