Stopwatch

How to use the Stopwatch (online)

Start timing, add laps (splits), stop, and reset. Works with buttons and keyboard.

Quick start

1. Click Start (or press Space) to begin the timer.
2. Click Lap (or press L) to capture a split time. Each lap shows the time for that lap and the total time.
3. Click Stop (or press Space again) to pause the timer.
4. Click Start to resume or Reset (or press R) to clear time and laps.

Read the display

• Format is MM:SS.mmm (minutes, seconds, milliseconds), e.g. 07:12.345.
• When running, the time updates smoothly; when stopped, it stays fixed until you resume or reset.

Use laps like a pro

• Split = time since the previous lap (or start). Use this for intervals, sets, or sections of a task.
• Total = time since you started the session. Use this to track the full run/session.
• Click Lap at each checkpoint. The table lists Lap, Split, and Total so you can compare pace.
• Need a fresh session? Click Reset to clear the display and remove all laps.

Keyboard shortcuts

• Space — start / stop
• L — lap (add split)
• R — reset (clear)

Examples

• Workouts: Start → Lap at the end of each set or interval → Stop → Review splits to see consistency.
• Study or Pomodoro: Start a focus block → Lap at each break → Use totals to track daily study time.
• Talks or events: Lap at each agenda item to see how long each segment took.

Accuracy & tips

• Timing uses performance.now() for millisecond precision in modern browsers.
• Keep the tab active for the smoothest display; the final recorded time remains precise even if the tab is in the background.
• If Space doesn’t start/stop, click anywhere on the page to remove focus from a text field and try again.

Troubleshooting

• Buttons do nothing: Check your browser’s JavaScript is enabled and reload the page.
• Shortcuts not working: Make sure the page (not another app or an input) has focus.
• Need a clean slate: Click Reset to clear time and all lap rows.

Free online stopwatch with laps and keyboard controls. Simple, fast, and mobile-friendly.