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Space Start/Stop L Lap R Reset
Different sports demand different levels of timing precision. Formula 1 qualifying measures to the thousandth of a second (0.001s) — the difference between pole position and second place can be a single millisecond. Olympic swimming times are recorded to the hundredth of a second (0.01s), and in the 2008 Beijing Olympics, Michael Phelps won the 100m butterfly by just 0.01 seconds. Marathon timing distinguishes between "gun time" (when the starting pistol fires) and "chip time" (when the runner actually crosses the start line), with official results using gun time but most runners caring about their chip time.
Track and field uses fully automatic timing (FAT) with photofinish cameras for official results. Swimming uses touchpads. But for training, a handheld stopwatch with lap splits — like this one — is still the most practical tool for coaches and athletes. The lap feature lets you track interval training, compare split times, and measure improvement over sessions.
Beyond sports, the stopwatch is a powerful productivity tool. The Pomodoro Technique — 25 minutes of focused work followed by a 5-minute break — is essentially structured stopwatch use. Tracking how long tasks actually take (as opposed to how long you think they take) is called time auditing, and it's the first step to better time management. Try timing your next three meetings or coding sessions — you might be surprised by the data.
Start the stopwatch, then click "Lap" (or press L) at each split point. Each lap records the time since the previous lap. The lap list shows individual lap times, cumulative times, and how each lap compares to your fastest lap (marked in green).
The stopwatch displays hundredths of a second. While browser-based timers using setInterval have ~5-15ms precision limits, this is more than sufficient for sports training, productivity tracking, and everyday timing. For professional competition, certified hardware timers are required.
Yes. Click the fullscreen button (⛶) or press F11. The stopwatch will fill your screen — ideal for presentations, races, or classroom use. Keyboard shortcuts (Space, L, R) work in fullscreen mode.
Space — Start / Stop the timer. L — Record a lap time. R — Reset the stopwatch (only when stopped). These shortcuts work regardless of which button is focused.