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Large Stopwatch

Readable digits with lap timing controls.

By Avery Brooks · Product & Performance TimingReviewed by Mina ChenUpdated
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What is the online stopwatch?

This online stopwatch runs directly in your browser and measures elapsed time with a clear display. It tracks hours, minutes, seconds, and milliseconds so you can time anything from short drills to long sessions.

Use laps (split times) to capture segments without stopping the total time. If you’d rather count down, use the online timer; if you need a reminder at a specific time of day, use the online alarm clock.

How do I use the online stopwatch?

  • Start / pause the stopwatch with the Start button (or Space).
  • Record a split with Lap while the total time keeps running.
  • Reset back to 00:00:00 when paused so you can start a fresh run.

The lap table includes each lap time, the cumulative elapsed time, and the local timestamp when you recorded the lap. Your lap data is saved in your browser, and you can export it as a CSV file for spreadsheets.

Stopwatch settings

Use settings and display controls to tailor the stopwatch:

  • Show or hide milliseconds.
  • Export your lap table as CSV, or clear it to start fresh.
  • Use full-screen mode (and zoom controls) for visibility at a distance.
  • Your preferences are stored locally in your browser.

What is the online stopwatch used for?

A stopwatch is useful whenever you need a simple, on-screen timer:

  • Timing practice questions in an exam or quiz
  • Tracking personal bests, reps, and intervals in workouts
  • Timing a presentation, speech, or classroom activity
  • Logging time spent on a task or project

In full-screen mode, the digits are easy to read from across a room. If you want to show the current time instead, try the online clock.

FAQ

Does this stopwatch work offline?
Once the page has loaded, the stopwatch can keep running even if you temporarily lose your connection.
How accurate is it?
The stopwatch measures elapsed time against a stable timer source, which helps keep sessions consistent even if the system clock changes.
Can I export my lap data?
Yes. Use Export to CSV to download your lap table for spreadsheets.
Can I record lap times?
Yes. Use the lap control while the stopwatch is running to record split times.

Authorship

See the full team
AB

Primary author

Avery Brooks

Product & Performance Timing

Stopwatches, split/lap timing, and full-screen timing for training.

Builds and tests stopwatch and timer interactions with an emphasis on reliability, large-format readability, and responsive controls.

MC

Editorial review

Mina Chen

Classroom & Study Timers

Pomodoro-style timing, classroom timers, exam timing patterns, and sound/notification UX.

Focuses on timers for classrooms and study sessions, including clear start/stop behavior, sound cues, and UX that works well on shared screens.

Also on the team: Rafael Torres · Time Zones & Clocks, Priya Nair · Date & Time Calculations.