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Measures elapsed time at 1/100 second precision with stacked lap history; auto-switches to hh:mm:ss.cs past one hour.

📘 How to Use

  1. Press the Start button to begin timing.
  2. Use the Lap button to record elapsed times.
  3. Use Stop to pause, and Reset to initialize.

Stopwatch

Centisecond stopwatch with lap history and auto-format for long sessions

Measures elapsed time at 1/100 second precision with stacked lap history; auto-switches to hh:mm:ss.cs past one hour.

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Laps
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Stopwatch

Track your time

Measure time directly in your browser with millisecond precision. Use it to manage study sessions, track workouts, or time your cooking—no installation required.

Features & Tips

  • Record laps: Click the "Lap" button to log splits without stopping the clock.
  • View from a distance: The high-contrast, oversized display remains readable from across the room.
  • Capture every millisecond: Monitor intervals with 1/100th-of-a-second accuracy.

FAQ

How accurate is the timer? The tool uses your browser's internal clock to provide millisecond precision. While perfect for daily tasks and fitness, browser rendering speeds mean it isn't intended for professional, Olympic-level officiating.

Does it stay running if I close the browser? No. Closing the tab or window resets the timer. Keep the tab open to ensure uninterrupted tracking.

Trivia

Before the 19th-century invention of the portable stopwatch, people used pulse beats or hourglasses to measure short intervals. These early devices became essential tools for horse racing long before they reached the athletics track.