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
I keep a stopwatch tab pinned in my browser most days. Hit Start to begin, Lap to mark a split without stopping (handy for tracking individual 400m repeats on the track), and Pause when you need a break. The whole thing takes about 2 seconds to learn.
It's accurate to the millisecond - more than enough for running, gym work, or timing how long my morning coffee routine actually takes (spoiler: longer than I thought). Everything runs locally in your browser, so a spotty Wi-Fi connection won't mess with your timing.
Keyboard Shortcuts for Quick Control
Pro tip: Use fullscreen mode (F) during presentations or training for a larger time display.
What I Actually Use This Stopwatch For
Running & Sports
I started using a stopwatch for track workouts back in college and never stopped. The lap feature is clutch - you can see each 400m split without breaking stride to check your phone.
My setup: Running a 5K on a track (12.5 laps) - I hit lap at each 400m and check splits after to see where I slowed down.
Gym Work
Rest periods matter more than most people think. I used to eyeball "about a minute" between sets - turns out I was resting 2-3 minutes. Now I actually time it.
What works for me: 90 seconds rest for heavy compounds, 60 seconds for accessories.
Tracking Where My Time Actually Goes
Here's an uncomfortable experiment: time how long tasks actually take versus how long you think they take. That "quick 10-minute email check"? Often 40 minutes when I measure it.
Try this: Start the stopwatch when you begin a task, pause for breaks. Reality check at the end of the day.
Cooking
When a recipe says "knead for 4 minutes" - that's a lot longer than you think when you're actually doing it. A stopwatch keeps you honest.
Pro tip: Time your first few attempts at a new recipe. You'll learn your actual cooking times vs. what the recipe claims.
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.