Stopwatch
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
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Uses the browser's performance.now() API for sub-millisecond accuracy in timing measurements.
Records and displays split times with automatic lap numbering and duration calculation between laps.
Counts down from a user-specified duration with visual and audio alerts at completion.
Updated: July 2026
A coach uses the stopwatch to time athletes' sprints and record lap times for performance analysis.
A science student uses the timer to precisely measure reaction times and duration of chemical processes.
A home cook uses the countdown timer to track multiple dishes with different cooking times simultaneously.
Precise stopwatch and countdown timer for timing activities, experiments, workouts, and more. Features lap times, countdown alerts, and millisecond precision.