How accurate is the stopwatch?

The stopwatch uses the browser's high-resolution Performance API, which has sub-millisecond resolution on most modern devices. The display rounds to 10 milliseconds so that it stays readable while running, but the underlying measurement is tighter than that.

Does it keep running if I switch tabs?

Yes. Elapsed time is computed from absolute timestamps captured on start and at each tick, not from an interval counter. So even if the tab is backgrounded, your computer sleeps briefly, or the browser throttles the tab, the displayed time stays correct when the tab becomes active again.

Laps are kept in memory for the current session and shown in a list while the tab is open. Reloading or closing the page clears them. There is no built-in export, but you can copy the lap list out of the page before reloading.

Stopwatch · Precision.

Cronómetro en Línea

Un cronómetro preciso con seguimiento de vueltas. Presiona Iniciar para comenzar, registra vueltas y ve tus tiempos más rápidos y lentos resaltados automáticamente.

Stopwatch with Progress Ring

Smooth 60fps ring, spring-press buttons, laps slide in.

00:00.00

WHY IT MATTERS

Why stopwatch pages still matter in search

Stopwatch intent looks simple, but the winning page is the one that feels reliable the moment it opens. People do not want to wonder whether the tab will drift, whether laps will be visible, or whether the display is precise enough for training, classroom, or production-floor timing.

That is why this page keeps the explanation, related tools, and lap-oriented FAQ around the live widget. The tool itself is interactive, but the surrounding copy is server-rendered so the page still explains what it does before JavaScript finishes hydrating.

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FAQ

Frequently asked questions

How accurate is the stopwatch?: The stopwatch uses the browser's high-resolution Performance API, which has sub-millisecond resolution on most modern devices. The display rounds to 10 milliseconds so that it stays readable while running, but the underlying measurement is tighter than that.
Does it keep running if I switch tabs?: Yes. Elapsed time is computed from absolute timestamps captured on start and at each tick, not from an interval counter. So even if the tab is backgrounded, your computer sleeps briefly, or the browser throttles the tab, the displayed time stays correct when the tab becomes active again.
Can I save my laps?: Laps are kept in memory for the current session and shown in a list while the tab is open. Reloading or closing the page clears them. There is no built-in export, but you can copy the lap list out of the page before reloading.

Cronómetro en Línea

Stopwatch with Progress Ring

Why stopwatch pages still matter in search

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Frequently asked questions

Never miss a launch, finale, or eclipse.

Cronómetro en Línea

Stopwatch with Progress Ring

Why stopwatch pages still matter in search

Related time tools

Frequently asked questions