Free Online Stopwatch with Lap Times

Need to time student presentations? Track lap times during gym class? Our stopwatch is designed for classroom use with precise timing and lap recording.

Features

Precise Timing: Millisecond accuracy using requestAnimationFrame for smooth updates.

Lap Recording: Track multiple lap times during a single session. See both lap time and total elapsed time.

Fullscreen Mode: Perfect for projection during gym class or presentations.

Simple Controls: Start, stop, lap, and reset with large, clear buttons.

No Installation: Works instantly in any browser on any device.

Classroom Use Cases

Timed Presentations

Give students a 3-minute presentation slot. Use the stopwatch to time them fairly. They can see the timer on screen, helping them pace themselves.

Science Experiments

Time reactions, measure speeds, or track durations. The lap function lets you record multiple trials without stopping.

Gym Class

Time sprints, relay races, or exercise intervals. Record each student's lap time for comparison.

Reading Speed

Time students reading passages to track fluency improvement over the school year. The lap function lets you time multiple students back-to-back.

Test Timing

Show students how much time they're spending on the test. More transparent than occasionally announcing time remaining.

Lap Times Feature

The lap recording is perfect for:

• Relay races: Record each leg's time
• Multiple students: Time back-to-back without resetting
• Progress tracking: Compare lap times to see improvement
• Fair comparison: All times saved with clear timestamps

Each lap shows:

• Lap number
• Lap time (time since last lap)
• Total elapsed time

Fullscreen for Visibility

Click the fullscreen button to:

• Display timer in huge numbers
• Remove all UI distractions
• Make it visible from across the gym
• Focus student attention on the time

Perfect when you're not at the computer to read times aloud.

Embed in Presentations

Add the stopwatch directly to PowerPoint or Google Slides:

1. Click "📎 Embed" to get the iframe code
2. Insert a Web Viewer in your slide
3. Paste the stopwatch URL
4. Start the stopwatch during your presentation

No need to switch windows or apps.

Free & Private

• No account required
• No data stored
• Works offline after loading
• Open source and transparent

Tips for Teachers

1. Projection tip: Use fullscreen mode and increase screen brightness
2. Fair timing: Start the stopwatch before saying "Go!" so reaction time doesn't affect results
3. Multiple rounds: Use lap times instead of resetting between students
4. Archive times: Take a screenshot of lap times for record-keeping

Try It Now

Use the stopwatch below:

You can also visit the full Stopwatch page to use it in a separate window.