Professional Online Stopwatch: Measure Every Moment

Track elapsed time with surgical precision. Record laps, capture splits, and analyze performance—all in your browser.

Professional Online Stopwatch: Measure Every Moment

Track elapsed time with surgical precision. Record laps, capture splits, and analyze performance—all in your browser.

Time is the one thing you can't get back. When you need to measure it—really measure it, down to the last fraction of a second—you need a tool you can trust. Our stopwatch doesn't mess around. Clean interface, precise tracking, and lap functionality that would make Olympic coaches nod in approval.

Whether you're an athlete chasing a personal best, a scientist recording reaction times, a musician timing a practice session, or just someone who wants to know exactly how long their sourdough takes to rise this stopwatch delivers. No distractions. No complicated menus. Just start, lap, stop, and analyze.

The magic is in the details. Watch those milliseconds tick by. Hit lap and instantly capture that moment forever. Review your splits and see exactly where you gained or lost time. It's like having a $500 stopwatch in your pocket, except it's free and lives in your browser.

Bookmark this page. You never know when you'll need to measure something that matters.

Tools for Time Keepers

Straight Answers

How precise is this stopwatch, really?
Down to the millisecond. It uses your device's high-resolution timer, so you're getting accuracy that rivals dedicated hardware. For 99.9% of real-world uses—sports training, cooking, experiments—it's indistinguishable from perfect. If you're timing something that requires atomic clock precision, you're probably in a lab anyway.
What's the maximum time I can measure?
Technically? Days. Weeks. Months. The stopwatch keeps running until you stop it. Realistically, you'll probably use it for minutes or hours. But if you want to see how many seconds old you are, go ahead—we won't stop you. Just don't blame us when you realize how much time has passed.
Can I export my lap times?
Currently, you can view them right on the screen—perfect for post-workout analysis or experiment logging. Copy them down, screenshot them, or just enjoy watching your improvement in real-time. For serious data nerds, we're working on export features that'll make your spreadsheet heart sing.
Does it work during workouts when my phone screen is off?
Here's the honest truth: the stopwatch keeps running in the background, but your screen might lock depending on your phone settings. Pro tip: adjust your auto-lock settings or keep your phone face-up while you train. The timer never stops—even if you can't see it.
Why use this instead of my phone's built-in stopwatch?
Great question. Phone stopwatches are fine for casual use. Ours is for people who take timing seriously. More laps, cleaner interface, zero ads, and it works identically across all your devices. Plus, no digging through apps—it's always one bookmark away. Pair it with our online calendar to schedule your training sessions.

For Athletes Who Chase Milliseconds

In sports, the difference between gold and silver is often measured in hundredths of a second. Your training stopwatch should reflect that reality. Our lap tracking lets you analyze every split, every interval, every segment of your performance. Runners can track mile splits and see where they faded. Swimmers can time each lap and identify their strongest lengths. Cyclists can measure segment times and compare against previous rides. The data doesn't lie—and now you have it. For interval training, our 15 minute timer helps structure your work-rest cycles.

For Scientists, Students, and Curiosity-Driven Humans

Science runs on measurement. How long does it take for a pendulum to complete ten swings? What's the reaction time of your lab partner? How quickly does ice melt at room temperature? These questions demand answers—and those answers start with accurate timing. Our stopwatch puts laboratory-grade measurement in your pocket. Use it for science fair projects, classroom demonstrations, or just satisfying your own curiosity about how the world works. Every great discovery started with someone asking "how long does that take?"

For Musicians, Dancers, and Performance Artists

Timing isn't just about sports—it's at the heart of every performance. Musicians need to know if their practice sessions are getting longer or more efficient. Dancers need to measure phrases and ensure transitions hit exactly on time. Public speakers need to calibrate their presentations to fit strict time limits. Our stopwatch respects your art. Clean, unobtrusive, always there when you need it. No flashing lights, no distractions—just the quiet tick of time helping you perfect your craft. Use our /planner to schedule your practice sessions and track progress over weeks.

The Lost Art of Knowing How Long Things Take

Here's something we've lost in the age of smartphones: a real sense of duration. We scroll for "a while." We wait for "a bit." We guess, estimate, and approximate our way through life. A stopwatch brings back precision. Time your morning routine and discover you spend 17 minutes staring at your closet. Measure your commute and realize traffic adds 12 minutes you never accounted for. Track your deep work sessions and learn your ideal focus window is exactly 47 minutes. Knowledge is power. Time knowledge is life-changing power. Our world clock helps you coordinate with others across time zones.

What Makes Our Stopwatch the One You'll Actually Use

Let's be honest—there are a million stopwatches out there. Here's why ours is different: - Zero friction : No accounts, no sign-ups, no "allow notifications" popups - Beautiful simplicity : Clean design that gets out of your way - Unlimited laps : Record as many splits as your activity demands - Cross-device perfection : Works the same on phone, tablet, and computer - No ads, ever : Because measuring time shouldn't be interrupted - Background operation : Switch tabs, your timer keeps running - Millisecond precision : When accuracy matters, we deliver Whether you're training for a marathon, perfecting a recipe, or just curious how long your cat naps, this stopwatch is ready. Need a seasonal perspective? Our season page shows you how daylight changes throughout the year.