Stopwatch
NewTrending 🔥Precise stopwatch with lap time tracking
How to Use Stopwatch
- 1Click Start to begin timing
- 2Click Lap to record a lap time
- 3Click Stop to pause
- 4Click Reset to clear all times
About Stopwatch
Our stopwatch tracks time precisely to the millisecond using the browser's high-resolution Performance API. Start timing with a single click, record unlimited lap times to compare intervals, and export your results for analysis or sharing.
The clean, large display shows hours, minutes, seconds, and milliseconds clearly. Each lap time is displayed with its split time (duration since the previous lap) and total elapsed time. You can delete individual laps, reset specific entries, or clear all recorded times at once.
Perfect for sports training, cooking, scientific experiments, board games, or any activity requiring precise timing. The stopwatch runs entirely in your browser with no server communication, so it works offline and your timing data remains completely private.
Key Features of Stopwatch
- Millisecond precision using the Performance API
- Unlimited lap time recording with split and total times
- Large, easy-to-read display with clear formatting
- Copy all lap times to clipboard for sharing
- Delete individual laps or clear all at once
- Pause and resume functionality without losing progress
- Works offline after initial page load
- Keyboard shortcuts for hands-free operation (Space to start/stop, L for lap)
Examples
Track 400m sprint intervals
Record lap times for each lap around the track to monitor pacing and improvement.
Input
Start stopwatch at race begin, press Lap at each 400m mark
Output
Lap 1: 58.2s, Lap 2: 59.1s, Lap 3: 57.8s, Lap 4: 56.4s - Total: 3:51.5
Time a cooking recipe with multiple steps
Track different cooking stages without needing multiple timers.
Input
Start when prep begins, Lap when each cooking phase completes
Output
Prep: 15:30, Sauté: 8:45, Simmer: 22:10, Total: 46:25
Common Use Cases
- Sports training and race timing with split analysis
- Cooking and baking with multiple timed stages
- Scientific experiments requiring precise measurements
- Board games and tabletop RPG session tracking
- Presentation rehearsal and speech timing
- Work study sessions and productivity time tracking
Troubleshooting
Stopwatch appears to run slow in background tabs
Solution
Browsers throttle JavaScript timers in inactive tabs to save battery. Keep the stopwatch tab visible for accurate timing.
Milliseconds display seems frozen or jumping
Solution
This is expected behavior. The display updates at 60fps for performance, but the underlying timing uses the high-resolution Performance API for accuracy.
Keyboard shortcuts not working
Solution
Ensure the stopwatch page has focus by clicking anywhere on it first.
Frequently Asked Questions
How precise is the stopwatch?
The stopwatch measures time to the millisecond (0.001 seconds) using the browser's high-resolution Performance API, which is accurate to within microseconds.
Can I export lap times?
Yes, click the 'Copy Laps' button to copy all recorded lap times to your clipboard in a formatted list.
Does the stopwatch work offline?
Yes, once the page loads, the stopwatch functions completely offline with no internet connection required.
Are there keyboard shortcuts available?
Yes: Space bar starts/stops the stopwatch, 'L' records a lap time, and 'R' resets. These work when the stopwatch page has focus.
What happens if I close the tab while timing?
Unfortunately, timing data is not persisted across page closures. Make sure to copy your lap times before navigating away.
Can I use this stopwatch for professional timing?
While highly accurate, this stopwatch is not certified for official competitive events. It's suitable for personal training, casual competitions, and general timing needs.
Are there keyboard shortcuts available?
Yes: Space bar starts/stops the stopwatch, "L" records a lap time, and "R" resets. These work when the stopwatch page has focus.
Is my timing data stored anywhere?
No, lap times exist only in browser memory and are lost when you close the tab. Nothing is sent to any server or stored persistently.