About Millisecond Precision Stopwatch & Lap Split Timer
High-precision browser stopwatch tracking hundredths of a second. Record unlimited lap splits, highlight fastest and slowest laps with delta variance, and export timing records directly to CSV.
Key Capabilities & Features
- Sub-millisecond precision with high-performance requestAnimationFrame
- Unlimited lap split recording with split and cumulative times
- Color-coded fastest (green) and slowest (red) lap highlights
- One-click CSV export of recorded lap times
How to Use Millisecond Precision Stopwatch & Lap Split Timer
1
Start Stopwatch
Click Start to begin timing with hundredths of a second accuracy.
2
Split Laps
Click Lap while running to record individual split times.
3
Export Records
Download your formatted split times as a CSV spreadsheet.
Privacy & In-Browser Execution Guarantee
Pure client-side timing using high-resolution browser performance timestamps.
Frequently Asked Questions
How accurate is this browser stopwatch?
The timer uses browser performance.now() high-resolution timestamps, delivering microsecond precision immune to background tab throttling.
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