Stopwatch
A precise stopwatch with lap tracking.
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Key Features
- Precise stopwatch accurate to the millisecond, running entirely in your browser.
- Record unlimited lap times and review the full lap history in a scrollable table.
- Shows the current lap time alongside the running total simultaneously.
- Highlights the fastest and slowest laps for instant performance comparison.
- Copy all lap data to your clipboard for use in spreadsheets or notes.
- Continues running in the background even when the tab is not in focus.
Frequently Asked Questions
How accurate is a browser stopwatch?
Modern browsers use the Performance API which provides sub-millisecond timing resolution. Display is updated at 60fps, accurate enough for most sports and study timing.
Will the stopwatch keep running if I switch tabs?
Yes. The timer tracks elapsed real time using timestamps, so it remains accurate even when the tab is in the background.
Can I save my lap times?
Use the copy button to export all lap times as plain text, which you can paste into a spreadsheet or training log.