Online Stopwatch
A big, clear stopwatch for laps, workouts, cooking, practice runs and classroom timing — hundredths of a second on the display, lap and split times recorded as you go.
Start the clock
Press Start, then Lap each time round — splits appear below.
Minutes : seconds . hundredths
Your laps will appear here — press Lap while the clock runs.
Time, measured honestly
Clock-based laps and splits — no installs, no accounts.
Hundredths on display
Minutes, seconds and hundredths, large enough to read across a room or glance at mid-workout.
Lap and total, every row
Each recorded lap shows its own duration beside the running total — real splits, not just timestamps.
Pause that resumes exactly
Pausing stores the elapsed time to the millisecond, so a resumed run continues from the true value.
About the stopwatch
A stopwatch has one job — measure elapsed time honestly — and the honest way to build one in a browser is to read the clock, not count ticks. This stopwatch calculates every displayed value from the actual time, so even when a background tab slows the screen updates down, the elapsed time stays exactly right.
Laps are recorded with both figures that matter: the duration of that lap and the total at the moment you pressed. Comparing splits — a runner’s laps, a swimmer’s lengths, a student’s repeated trials — needs both, and scrolling a list of bare timestamps is nobody’s idea of analysis.
There is deliberately nothing else: no accounts, no saved history on a server, no permissions. It opens fast, reads clearly at a distance, and the times live on the page in front of you.
Frequently asked questions
Accuracy, laps and background tabs, answered plainly.
How accurate is this stopwatch?
The display shows hundredths of a second and the underlying time is read from the system clock each update, so the measurement is as accurate as your device’s clock.
Does it keep time in a background tab?
Yes — because elapsed time is calculated from the clock, not from counting updates. The display may refresh less often in a background tab, but the value catches up exactly when you return.
What is the difference between lap time and total?
Lap time is how long that single lap took; total is the elapsed time since the stopwatch started. Both are shown on every lap row.
How many laps can I record?
There is no set limit — each press adds a row. Very long sessions with hundreds of laps simply make a long list.
Does it work on a phone?
Yes — it is a web page, so it runs in any modern phone browser with no installation. Keep the screen awake for continuous display.
Are my times saved anywhere?
No. Laps exist on the page while it is open and are gone when you close or reset it.