Free Online Stopwatch — Millisecond Precision & Lap Times
Track elapsed time down to the millisecond with start, pause, resume, reset, and split lap recording.
Our free Online Stopwatch offers precise timekeeping using high-resolution performance timestamps (`performance.now()`). It tracks elapsed hours, minutes, seconds, and milliseconds with lap split logging, clean memory management, and zero timer drift.
How to Use the Free Online Stopwatch — Millisecond Precision & Lap Times
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1
Click "Start"
Click the Start button to begin timing immediately with high-resolution millisecond precision.
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2
Record Laps
Click the "Lap" button while running to record intermediate split times and lap intervals.
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3
Pause & Resume
Pause the stopwatch at any point and resume seamlessly without losing elapsed time.
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4
Reset Timekeeper
Click Reset to clear the display back to 00:00:00.000 and wipe recorded lap splits.
Why Use a Web Stopwatch with Millisecond Precision?
Unlike basic timers that can experience lag or drift when tabs switch, our stopwatch uses browser high-resolution timestamps to calculate elapsed time accurately even during multi-tasking.
Features
- Sub-Millisecond Accuracy: Calculated using the monotonic
performance.now()API. - Lap & Split Tracking: Logs each individual lap interval and cumulative split time in a clean responsive table.
- Memory Leak Protection: Timers and request animation loops are cleanly garbage-collected on pause or reset.
- Keyboard Shortcuts: Press Space to start/pause and L to record a lap for rapid operation.