Stopwatch and Timer

A browser-based stopwatch and countdown timer with lap tracking. Start, stop, and reset with one tap.

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1. Choose between stopwatch mode for measuring elapsed time upward or countdown timer mode for counting down from a set duration. 2. In stopwatch mode, tap Start to begin timing, then use the Lap button to record split times at each interval you want to track. 3. In timer mode, set the desired countdown duration in hours, minutes, and seconds, then tap Start to begin the countdown. 4. View recorded lap times in the scrollable table showing each individual lap duration alongside the cumulative elapsed time. 5. Tap Stop to pause either mode, and Reset to clear the session and start fresh for a new timing run.

About This Tool

The Stopwatch and Timer is a dual-mode timing tool that runs entirely in your browser. Use the stopwatch mode to measure elapsed time with start, stop, lap, and reset controls. Switch to timer mode to set a countdown from any duration and get an alert when time is up.

The stopwatch records lap times and split times so you can track intervals during workouts, cooking, presentations, or any activity where you need to measure multiple segments. Lap data is displayed in a clear table with individual lap durations and cumulative time.

The countdown timer supports hours, minutes, and seconds. It provides visual and audio alerts when the timer reaches zero. Both modes display time with millisecond precision and feature large, easy-to-read displays optimized for mobile use.

Frequently Asked Questions

Yes. The stopwatch uses a time-reference approach rather than interval counting, so switching tabs or minimizing the browser does not affect accuracy. The elapsed time is always correct when you return.
The timer is accurate to within a few milliseconds under normal conditions. It uses high-resolution timestamps available in modern browsers for precise time measurement.
Yes. In stopwatch mode, tap the lap button to record a lap. Each lap shows the individual lap duration and the cumulative elapsed time. All laps are listed in a scrollable table.
Yes. When the countdown reaches zero, it triggers both a visual notification on screen and an audio alert sound. Make sure your browser allows audio playback for the sound alert.
The tool operates in one mode at a time - either stopwatch or countdown timer. You can switch between modes, but only one is active at any given moment.

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