Stopwatch
Precise timing with millisecond accuracy and lap recording.
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Precise timing with millisecond accuracy and lap recording.
Click Start to begin timing. The stopwatch tracks time with millisecond precision. Click Stop (the same button) to pause. Click again to resume. Hit Lap to record a split time without stopping the stopwatch. Click Reset to clear everything and start fresh.
Lap times are displayed in a table below the stopwatch. The best and worst lap times are highlighted in green and red respectively, making it easy to spot your performance trends. When you are done, click Export CSV to download all your lap times as a spreadsheet-compatible CSV file.
A precise stopwatch is essential for sports timing (sprints, swimming, cycling laps), cooking (timing recipes to the second), science experiments (measuring reaction times, pendulum periods), games (speed runs, puzzles), and any task where accurate time measurement matters. The lap feature makes it ideal for tracking intervals during training sessions.
This stopwatch uses your browser's high-resolution timer (performance.now()) for the most accurate timing possible in a web browser. The display updates smoothly to show real-time milliseconds as they pass.