Online Stopwatch
Log interval data using high-resolution browser clocks. Capture lap times, calculate split totals, and export raw records to clipboard for data analysis.
Start the timer and save lap splits in the result panel.
Please configure parameters and execute the action.
About Online Stopwatch
Online Stopwatch measures elapsed time to the millisecond in the browser. Record laps to compare each split with the cumulative total.
How to Use
Start the clock, record laps, and pause or reset as needed.
- Press Start to begin timing.
- Press Lap while running to save a split.
- Pause and resume without losing elapsed time, or reset to clear all laps.
Examples
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Three running laps
Lap 1: 00:01:42.350 Lap 2: 00:01:39.820 Lap 3: 00:01:38.910 Total time: 00:05:01.080 Fastest lap: 00:01:38.910
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Cooking intervals
Lap 1 - Prep: 00:02:30.000 Lap 2 - First side: 00:04:00.000 Lap 3 - Second side: 00:03:45.000 Total elapsed: 00:10:15.000
Real-World Usage Scenarios
- Industrial Cycle Time Studies - Identify bottlenecks in manufacturing by recording individual task durations using the lap function to analyze process efficiency.
- Scientific Laboratory Experiments - Monitor reaction times or observation intervals with millisecond precision for accurate data collection in controlled environments.
- Public Speaking - Presentation Practice - Segment your speech into sections and use lap splits to ensure each slide or topic fits within allocated event time slots.
- UX Usability Testing - Measure 'time-on-task' for participants during software interface testing to determine where users struggle or succeed.
Frequently Asked Questions
How accurate is the millisecond tracking?
The tool utilizes the browser's high-resolution performance clock (performance.now), providing sub-millisecond precision independent of system clock drift.
Does the timer stop if I switch browser tabs?
No. The logic calculates elapsed time based on the timestamp when you started, ensuring accuracy even if the tab is backgrounded or inactive.
Can I save my lap results for later?
Results are stored in the current session. For long-term records, copy the text in the result panel before closing the browser window.
Is an internet connection required while the timer is running?
Once the page is loaded, the stopwatch logic runs locally in your browser and does not require an active connection to maintain timing.
