Online Stopwatch
Start, stop and record laps, in huge digits for the whole class.
- 100% free
- No signup
- Private: stays in your browser
- Updated November 2026
Embed this stopwatch on your class websiteFree for Google Sites, blogs and LMS pages. No ads inside the embed.
How to use the stopwatch
- 1
Press Start or the space bar. The time runs in minutes, seconds and hundredths.
- 2
Press Lap (or L) to record split times. The fastest and slowest laps are highlighted.
- 3
Press Stop to pause, Reset to clear, and F for a giant fullscreen view.
An online stopwatch the whole class can see
This online stopwatch measures time to the hundredth of a second and shows it in digits large enough for the back row. Start and stop it with the space bar, record laps with L, and press F to put it on the projector.
It's built for the classroom: relay races and fitness laps in PE, reaction times and pendulum swings in science, reading fluency checks, or how long the class takes to line up. Laps show both the split time and the running total, and the fastest and slowest laps are marked so students can see their progress at a glance.
The stopwatch keeps exact time from the clock, so it stays accurate if you switch tabs, and it even survives a page reload. Copy the lap list to paste into a spreadsheet.
Classroom ideas for a stopwatch
Fluency reads
Time a one-minute read or a full passage and track words per minute over the term.
Science timing
Pendulum swings, falling objects, ice melting: record laps for each trial and compare.
PE laps
Press Lap as each runner finishes and copy the times into your gradebook.
Transition challenge
How fast can the class line up? Post the record and try to beat it.
Reaction game
One student starts the stopwatch, another stops it when they see a signal.
Presentation practice
Students time their talk to fit the limit.
Frequently asked questions
Is the online stopwatch accurate?
Yes. It measures from your device's clock and shows hundredths of a second. It stays accurate in a background tab.
How do I record lap times?
Press Lap or the L key while it's running. Each lap shows its split and the total time.
What are the keyboard shortcuts?
Space starts and stops, L records a lap, R resets and F switches to fullscreen.
Can I save my laps?
Press Copy laps to copy them as text you can paste into a spreadsheet or document.
Will I lose the time if I reload the page?
No. The stopwatch remembers its state in your browser.