How accurate is this online stopwatch?

The stopwatch uses your browser's high-resolution timer, so it is accurate to hundredths of a second and keeps precise time even during long sessions. It is more than accurate enough for workouts, studying, cooking, and everyday timing.

What are lap times used for?

A lap records the time at a moment without stopping the clock, so you can capture split times — for example each lap of a run, each round of an exercise, or each stage of a task — while the overall timer keeps running.

Does the stopwatch keep running if I switch tabs?

Yes. The elapsed time is calculated from real timestamps, so even if the tab is in the background, the stopwatch shows the correct time when you return to it.

Do I need to install an app?

No. It runs entirely in your web browser on any device — phone, tablet, or computer — with nothing to download and no account to create.

Yes, completely free with no signup, no ads interrupting the timer, and no limit on how long or how often you use it.

Online Stopwatch

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Online Stopwatch — Precise Timing, Instantly, in Your Browser

Sometimes you just need a stopwatch, right now, without hunting for your phone or installing an app. This free online stopwatch starts instantly in your browser, times to the hundredth of a second, and includes lap times, pause, and reset. It works on any device, keeps accurate time even if you switch tabs, and never asks you to sign up. Whether you are timing a workout, a study session, a recipe, or a presentation, it is ready the moment the page loads.

Accurate to the Hundredth of a Second

Precision matters in a stopwatch, and this one delivers it by using your browser's high-resolution timer and calculating elapsed time from real timestamps. That approach has an important benefit: the clock stays accurate over long sessions and does not drift, and because the time is derived from actual timestamps rather than a counter that could pause, it shows the correct elapsed time even if the browser tab was in the background. You get reliable timing you can trust for anything from a few seconds to hours.

Lap Times: Capturing Splits Without Stopping

The lap feature is what separates a real stopwatch from a simple timer. Tapping lap records the exact time at that instant while the main clock keeps running, so you can capture a series of splits — each lap of a run, each set in a workout, each phase of a task — and compare them afterward. This is invaluable for training, where seeing whether your laps are speeding up or slowing down tells you far more than a single total time. All your laps are listed so you can review your pacing at a glance.

Where an Online Stopwatch Comes in Handy

Workouts and training: time intervals, rest periods, and record lap splits for runs or circuits.
Studying: apply focused-work techniques and track how long you actually concentrate.
Cooking: time steps precisely when a recipe depends on it.
Presentations and speeches: rehearse to a target length and check your pacing.
Experiments and tasks: measure how long anything takes, from a science experiment to a chore.

No App, No Signup, No Interruptions

Because it runs in the browser, there is nothing to install and nothing cluttering your device. It works the same on a phone, tablet, or computer, so whichever screen is nearest, your stopwatch is one click away. There is no account to create, no cost, and no limit on how long or how often you use it — just press start and go.

Pause, Resume, and Reset With Confidence

Full control is built in. Pause holds the current time when you need to stop briefly, and resume picks up exactly where you left off without losing a fraction of a second. Reset returns the clock to zero for a fresh start. These simple controls make the stopwatch flexible enough for interrupted tasks and repeated timing sessions alike. Explore our other time tools — including a Pomodoro timer and countdown timers — to cover every kind of timing you need.