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Why Use Our Online Stopwatch?
Millisecond Precision
Accurate timing down to 10 milliseconds. Perfect for sports, workouts, and experiments.
Lap Times
Record unlimited laps with split times. Highlights your best and worst laps.
Countdown Mode
Set a custom countdown timer with audio alert when time's up.
Works Everywhere
Responsive design works on desktop, tablet, and mobile devices.
No Download
Works directly in your browser. No app installation needed.
100% Free
No registration, no ads, no limits. Use as many times as you need.
Common Uses for Stopwatch
Sports & Fitness
- Timing running laps or sprints
- HIIT workout intervals
- Swimming lap times
- Rest periods between sets
Work & Study
- Timing presentations or speeches
- Exam practice sessions
- Meeting time management
- Task duration tracking
Frequently Asked Questions
How accurate is the stopwatch?▼
Our stopwatch uses high-resolution timing with JavaScript's Date.now() and updates every 10 milliseconds. While browser-based timers can't match dedicated hardware, it's accurate enough for most practical uses like sports, workouts, and general timing.
What are lap times and split times?▼
A lap time (or split time) is the duration between two consecutive lap markers. The total time is cumulative from when you started. For example, if you complete lap 1 in 30 seconds and lap 2 in 25 seconds, your split for lap 2 is 25s and total is 55s.
Does it work if I switch browser tabs?▼
Yes! The timer continues running even when you switch tabs. The current time also shows in the browser tab title so you can monitor it without coming back to the page.
Can I use this on my phone?▼
Absolutely! The stopwatch is fully responsive and works on any device with a web browser - smartphones, tablets, laptops, and desktops. Just open the page and start timing.
What's the difference between stopwatch and countdown?▼
A stopwatch counts up from zero to measure elapsed time. A countdown timer starts from a set time and counts down to zero, alerting you when time's up. Use stopwatch for measuring durations, countdown for setting limits.