Elapsed time tool
Online Stopwatch
Measure elapsed time in your browser, record laps and export the lap table as a CSV file. It is useful for workouts, sprint timing, study blocks, calls, experiments and routine productivity checks.
Stopwatch
00:00:00.00
Lap results
| Lap | Total time | Split |
|---|---|---|
| No laps yet. | ||
Stopwatch guidance
Start the stopwatch when the activity begins, press Lap whenever you need an intermediate reading, and pause when the activity stops. The CSV export is generated locally in your browser and contains lap number, total elapsed time and split time.
Like all browser-based stopwatches, this tool depends on your device clock and browser runtime. It is suitable for everyday timing, but not for certified sport timing, medical use, aviation, legal deadlines or other safety-critical purposes.
Why lap timing matters
A single final time tells you how long the whole activity took. Laps and splits tell you how that time was distributed. During exercise, laps can reveal pacing. During practice, they can show whether each repetition is getting faster or slower. During work, they can make repeated tasks easier to compare.
The CSV export is included for people who want a lightweight record. You can import the file into a spreadsheet, training log, notes app or project document. Because the file is generated locally in your browser, ClockWest does not need to receive your lap data.
Stopwatch FAQs
What is the difference between total time and split time?
Total time is the elapsed time since the stopwatch started. Split time is the time since the previous lap.
Where is CSV data stored?
The CSV file is generated on your device when you press Export CSV. ClockWest does not receive your lap table.
Can I keep the stopwatch running overnight?
It may continue while the browser is active, but device sleep and browser tab suspension can affect updates. Use a dedicated device for long or critical measurements.