Stopwatch
Centisecond-precise stopwatch with laps, live current-lap readout & fastest ⚡/slowest 🐢 highlights.
00:00.00
⏱️A precise stopwatch with smart laps
Hundredth-of-a-second timing on your browser's high-resolution clock, with lap splits that keep recording without stopping the run — and your fastest ⚡ and slowest 🐢 laps highlighted automatically, so patterns jump out without arithmetic.
💡Timing things well
- Lap at every repetition — the split list becomes your consistency report.
- For sports drills, watch the fast/slow spread: a shrinking gap means improving consistency.
- Time your real problem-solving speed per question before exams — then set per-question budgets.
- The display runs on performance.now(), which doesn't drift with system-clock changes.
💡 Frequently Asked Questions
How accurate is this stopwatch?+
It uses the browser's high-resolution monotonic timer (performance.now()), accurate to a hundredth of a second and immune to system-clock adjustments mid-run.
What are lap times for?+
Laps record split times without stopping the clock — for repeated drills, running laps, experiment steps, or per-question solving times. Fastest and slowest laps are highlighted automatically.
Does the stopwatch keep running if I switch tabs?+
Yes — elapsed time is computed from the start timestamp, not from ticks, so returning to the tab shows the true elapsed time even if the display paused while hidden.
Stopwatch or Pomodoro timer — which should I use?+
Stopwatch measures how long something takes (open-ended); the Pomodoro timer enforces how long you work (fixed sprints). Time a task once with the stopwatch, then budget it into pomodoros.