Online Stopwatch
Precise time measurement with millisecond accuracy
Perfect for running, fitness, studying, and any activity that needs accurate timing. Includes lap times, fullscreen mode, and works offline.
How to Use This Online Stopwatch
Our online stopwatch is simple and precise. Click the Start button to begin measuring time. Use the Lap button to record split times without stopping the stopwatch - perfect for measuring individual laps during running or fitness exercises. The Pause button stops the timer, which you can resume at any time. To reset the time, click Reset.
The stopwatch measures time with millisecond precision (0.001 seconds), which is accurate enough for most sports and professional uses. The timer runs locally in your browser, so timing is not affected by your internet connection.
Keyboard Shortcuts for Quick Control
Pro tip: Use fullscreen mode (F) during presentations or training for a larger time display.
Practical Uses for a Stopwatch
Running & Sports
A stopwatch is essential for measuring running times - whether you're on a track, running outdoors, or on a treadmill. The lap time feature lets you record each lap without stopping the overall timer.
Example: Running a 5K on a track (12.5 laps of 400m) - record each lap time to see your total time and pace distribution.
Fitness & Gym
For HIIT (High-Intensity Interval Training), CrossFit, or circuit training, you need precise timing of intervals and rest periods. The stopwatch shows exactly how long you've been exercising.
Example: Tabata workout - 20 seconds full effort, 10 seconds rest, repeat 8 times.
Studying & Productivity
The time-boxing technique uses a stopwatch to measure time spent on specific tasks. You'll discover how long tasks actually take - writing essays, preparing for exams, or completing assignments.
Example: Start the stopwatch when beginning a task, pause during breaks. At the end of the day, you'll have an accurate overview of productive time spent.
Cooking & Baking
While we have a dedicated kitchen timer, a stopwatch is useful when you need to measure preparation time (not countdown). For example, when mixing dough for exactly 5 minutes or checking marinating time.
Example: Recipe says "knead for 3-4 minutes" - start the stopwatch and knead with confidence for the right duration.
Frequently Asked Questions
How accurate is this online stopwatch?
Our stopwatch measures time with millisecond precision (0.001 seconds). Accuracy depends on your device's performance and browser. For regular sports and study purposes, the accuracy is more than sufficient. For official professional sports timing, we recommend certified hardware stopwatches.
What is a lap time (split time)?
A lap time (or split time) is a feature that records the current time without stopping the stopwatch. It's used when measuring multiple segments - like individual laps during a run. Each lap time is saved to a list so you can compare which lap was fastest.
Does the stopwatch run when I minimize the browser?
Yes! The stopwatch continues running when you minimize the window or switch to another tab. Time is measured accurately because we use a JavaScript timer that runs in the background. When you return to the tab, you'll see the correct current time.
Can I use the stopwatch offline?
Yes, after your first visit, the stopwatch is cached in your browser and works without an internet connection. You can also add this page to your phone's home screen as an app (PWA - Progressive Web App).
How do I reset the stopwatch?
Reset the stopwatch using the "Reset" button or by pressing R. Reset clears all recorded lap times and sets the time back to 00:00:00.000. You can reset even while the stopwatch is running.