Online Stopwatch
Stopwatch with laps and countdown timer.
Online stopwatch: precision and features
Our online stopwatch offers centisecond precision (10 milliseconds), sufficient for most everyday uses such as sports training, cooking intervals, timed presentations, and productivity measurements. The lap function lets you record split times without stopping the stopwatch, ideal for comparing intervals or recording exercise sets.
The countdown timer complements the stopwatch, allowing you to set a specific time and receive a sound alert when it runs out. It's perfect for productivity techniques like Pomodoro, rest times at the gym, or any activity where you need to control duration. Both tools work directly in your browser without the need for installations.
Frequently asked questions
How accurate is it?
The stopwatch has centisecond precision (10 ms), which is more than sufficient for general use. Professional competition stopwatches use specialized hardware with millisecond precision, but for personal training and everyday measurements, this precision is adequate.
Does it work if I switch tabs?
Yes, the stopwatch keeps counting even if you switch tabs or minimize the browser. It uses the Date.now() function to calculate elapsed time, which ensures the time is accurate even if the browser reduces the update frequency in background tabs.
Can I use laps for intervals?
Yes, the lap function is perfect for interval training. Press "Lap" at the end of each interval to record the cumulative time. You can compare lap times to evaluate your performance and consistency in exercise sets.
Want to learn more? Read our complete guide →