⏱️ Online Stopwatch

Precise timing with lap recording and millisecond accuracy.

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How to Use This Online Stopwatch

This free stopwatch provides millisecond precision and is perfect for timing workouts, cooking, presentations, or any activity that requires accurate measurement.

  1. Click Start to begin timing
  2. Click Lap to record a split time without stopping the clock
  3. Click Stop (same button as Start) to pause the timer
  4. Click Reset to clear the timer and all lap records

Features

  • Millisecond accuracy — Displays time down to hundredths of a second
  • Lap recording — Track individual lap times and cumulative totals
  • Keyboard friendly — Works in any browser, no installation required
  • Always free — No signup, no ads blocking the timer

When to Use a Stopwatch

Stopwatches are essential for athletes tracking intervals, students timing presentations, cooks monitoring recipes, and professionals measuring process efficiency.

Want to level up your time management? Read our Time Blocking Techniques Guide for strategies that complement timed work sessions.

What Is This Online Stopwatch?

This is a free, precision online stopwatch that measures elapsed time down to hundredths of a second with a built-in lap timer. It's designed for anyone who needs accurate timing — athletes tracking interval training, students timing presentations, professionals measuring task durations, or cooks monitoring recipe steps. The tool runs entirely in your browser using high-resolution JavaScript timing, requires no installation, and works on any device with a modern web browser.

How to Use This Tool

  1. Start timing — Click the "Start" button to begin the stopwatch. The display updates in real time showing hours, minutes, seconds, and centiseconds. Click "Stop" (the same button) to pause at any point.
  2. Record laps — While the stopwatch is running, click "Lap" to record a split time. Each lap shows both the individual interval duration and the cumulative total, displayed in a scrollable table below the timer.
  3. Reset when done — Click "Reset" to clear the timer and all recorded lap data, returning the stopwatch to zero for your next timing session.

Why Use Our Stopwatch?

This stopwatch provides centisecond (1/100th second) accuracy using the browser's high-resolution timer, making it suitable for athletic training, scientific experiments, and process measurement. The lap recording feature tracks both individual split times and running totals in an easy-to-read table format. Unlike phone stopwatch apps, it displays everything on a large screen for better visibility, and the lap history remains visible at all times without scrolling through the main interface.

Tips & FAQ

How accurate is this online stopwatch?

The stopwatch uses Date.now() and requestAnimationFrame for display updates, providing accuracy within a few milliseconds — more than sufficient for workout intervals, cooking, presentations, and most practical timing needs. For Olympic-level precision, dedicated hardware timers are recommended.

Can I use keyboard shortcuts to control the timer?

Currently the stopwatch is controlled via the on-screen buttons. For the fastest response, keep your cursor positioned over the Start/Stop button. The large button targets make it easy to hit quickly on both desktop and mobile devices.

What happens to my lap data when I close the page?

Lap data exists only in the current session and is not saved to storage. If you need to keep your lap records, note them down or take a screenshot before closing the page. This keeps the tool simple, fast, and privacy-respecting with zero data persistence.