Enter a target time — the stopwatch will show progress and time remaining in real time
Pace Calculator
Enter your distance — we'll calculate your running pace and average speed as you go
—
min/km
—
min/mile
—
km/h
Space Start / Pause
L Lap
R Reset
F Fullscreen
How to use the stopwatch
1
Press Start
Or press Space. The stopwatch starts counting with centisecond precision.
2
Record laps
Press Lap or L to save a lap. Best lap is green, worst is red.
3
Export results
Download a PDF or PNG report, or export to CSV — no print dialogs.
Use Cases
🏃
Running & Sports
Track laps, monitor pace, analyze splits. Wake Lock keeps the screen on during workouts.
🍳
Cooking
Time multiple dishes simultaneously with up to 3 independent stopwatches.
📚
Study & Pomodoro
Measure how long tasks take. Target time reminds you when to take a break.
🏊
Swimming
Record lap times every 50m and track your average split over the session.
💻
Dev & Testing
Time builds, deploys and tests. CSV export logs multiple runs for comparison.
🎮
Gaming & Competitions
Speedruns, board game turns, contests — record attempts and compare results.
Frequently Asked Questions
How accurate is the online stopwatch?
The stopwatch uses Date.now() and requestAnimationFrame — accuracy is about 1ms.
Time is not lost when you switch tabs because we store the start timestamp, not a running counter.
How many stopwatches can I run at the same time?
Up to 3 independent stopwatches. Each has its own display, lap table, statistics and export buttons. Click
the + button to add another.
How do I export the lap table?
Each stopwatch has four export buttons: Copy (plain text to clipboard), CSV (for Excel/Google Sheets),
Image (PNG report), and PDF (formatted PDF report). All downloads happen without any print dialogs.
What is Wake Lock?
Wake Lock API prevents your phone or tablet screen from dimming while the stopwatch is running. It is
activated automatically when you start the stopwatch and released on pause or page close. Supported in
Chrome, Edge and Safari 16.4+.
Can I use fullscreen mode?
Yes. Click the fullscreen icon on any stopwatch card or press F. In fullscreen mode only the stopwatches
are shown — no header, footer or extra blocks.
What is the pace calculator?
The pace calculator shows your running pace in min/km and min/mile based on the time of the first
stopwatch and the distance you enter. It updates every second and is useful for runners, cyclists and
triathletes.
How does target time work?
Enter a target time in HH:MM:SS or MM:SS format. A progress bar shows how much of the target has elapsed
and text shows the remaining time. It is based on the first stopwatch.
Can I control the stopwatch with the keyboard?
Space = start/pause, L = lap, R = reset, F = fullscreen.
Shortcuts work for the last clicked stopwatch (default: the first one). They are disabled when an input
field has focus.