Fullscreen Stopwatch
A fullscreen stopwatch counts up from zero on a large, easy-to-read display, so a whole room can watch the elapsed time climb. This page opens a clean stopwatch with lap support, built for training, classrooms, and events where the time needs to be visible from a distance rather than on one person's phone. Press start and switch to full screen.
Count up, not down
A stopwatch measures how long something takes, counting up from zero the moment you start. Reach for it when you do not know the duration in advance: how quickly a student finishes, how long a drill runs, or how long a discussion actually lasted. It answers the question how long did that take, where a countdown timer answers how much time is left.
Shown full screen, the elapsed time is large enough to read across a gym, classroom, or lab, which is what makes it useful for a group rather than a single person timing on a wristwatch.
Laps for repeated efforts
The lap button records a split without stopping the clock, so you can capture each interval while the overall time keeps running. That is what makes a stopwatch useful for repeated efforts — running intervals, swimming lengths, or timed drills — where you want to compare one round against the next.
A typical flow is simple: start when the first effort begins, tap lap at the end of each round, then pause to freeze the final time and reset before the next group goes. Keyboard shortcuts make start, lap, and reset quick when your hands are busy.
On a shared display
Switch to full screen so the browser chrome disappears and only the stopwatch is visible, which matters when an instructor is watching a whole class rather than one runner. On supported browsers the page keeps the screen awake in full screen, so a long session will not dim or sleep mid-count.
The display shows minutes, seconds, and hundredths of a second, and counts hours once the time passes sixty minutes, so it works for both quick drills and longer sessions.
Frequently asked questions
How do I record laps?
Press start, then tap the lap button at each interval. Each lap is recorded without stopping the clock, so the overall elapsed time keeps running while individual splits are captured.
What is the difference between a stopwatch and a timer?
A stopwatch counts up from zero to measure how long something takes. A timer counts down from a set duration to zero. Use the stopwatch for open-ended timing and a timer for a fixed limit.
Does it keep the screen awake?
In full screen the page requests a screen wake lock on supported browsers, so the display stays on during a long session. On unsupported devices, disable sleep in the system settings.
Can I read it from across a room?
Yes. In full screen the numbers fill the display, so the elapsed time is legible from across a gym, classroom, or event space.
Is the fullscreen stopwatch free?
Yes. It runs in the browser with no account or install, on laptops, tablets, and shared displays.