⏱️ Timer Tool

Stopwatch

Precision stopwatch with lap tracking, split times, and instant fastest/slowest lap highlighting.

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Millisecond Precision

Updates every 10ms for accurate centisecond display — suitable for sports timing, workouts, and lab use.

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Lap Tracking

Record unlimited laps. The fastest and slowest laps are automatically highlighted in green and red.

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Split Times

Each lap shows both the split time (lap duration) and the cumulative total elapsed time.

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Mobile Friendly

The big display and large buttons work perfectly on phones — tap Start and Lap with ease during any activity.

Frequently Asked Questions

Does the stopwatch keep running if I switch tabs?▼

Yes. We record the actual start timestamp rather than counting intervals, so the elapsed time remains accurate even if the browser tab is in the background or your device sleeps briefly.

How many laps can I record?▼

There is no limit on laps. You can record as many as needed — the list is scrollable so it never takes over your screen.

What is the difference between split and total time?▼

Split time (lap time) is the duration of that individual lap. Total time is the cumulative elapsed time from the very start up to when that lap was recorded.

Will the stopwatch reset if I refresh the page?▼

Yes — refreshing the page resets the stopwatch. If you need to leave the page, record the current time first. There is no persistence across page refreshes by design.

How to Use the Online Stopwatch

Click Start to begin timing. The display shows hours, minutes, seconds, and milliseconds.
Use the Lap button to record split times without stopping the main timer.
Click Stop to pause, then Resume to continue or Reset to start over.

When You Need This

Timing workouts, runs, or exercise intervals.
Measuring how long tasks take for time management and productivity tracking.
Timing presentations or speeches to stay within your allotted time.
Conducting experiments or tests that require precise timing.

Good to Know

Browser-based stopwatches are accurate to within a few milliseconds for most purposes. For competitive sports timing, dedicated hardware is more reliable. If you need a countdown instead, use a timer tool.