Online Stopwatch
Millisecond precision with lap timing
| Lap # | Lap Time | Total Time |
|---|
About This Online Stopwatch
Our free online stopwatch delivers millisecond-level precision directly in your browser. With a clean, easy-to-read display and intuitive controls, it is designed for anyone who needs accurate time measurement — from athletes and coaches to students, professionals, and hobbyists.
The built-in lap function lets you record split times without stopping the main clock. Each lap is displayed in a scrollable table, and the fastest and slowest laps are automatically highlighted so you can instantly identify your best and worst intervals.
Stopwatch Features
- Millisecond Precision — Accurate timing powered by high-resolution browser APIs for reliable measurements.
- Lap Timing — Record unlimited split times. Each lap shows both the individual lap duration and cumulative total time.
- Best & Worst Lap Highlighting — Fastest laps are highlighted in green and slowest in red so you can track performance at a glance.
- Fullscreen Mode — Expand the stopwatch to fill your entire screen for maximum visibility during activities.
- Clean Interface — Minimalist design with a large, easy-to-read display that works on any screen size.
Common Stopwatch Applications
- Sports Timing — Track sprints, swim laps, cycling intervals, and race splits with precision.
- Fitness Training — Time your sets, rest periods, and overall workout duration to stay on track.
- Science Experiments — Measure reaction times, chemical processes, and other time-dependent observations.
- Cooking — Time blanching, steeping, or any quick kitchen task that requires precision.
- Productivity — Measure how long tasks take to improve time estimates and personal efficiency.
- Games & Competitions — Keep fair and accurate time for speed challenges, debates, and timed rounds.
How to Use Laps Well
A lap records a checkpoint without stopping the main timer. Use laps for repeated attempts, exercise rounds, swim lengths, presentation sections, or task stages. The total time tells you how long the whole session took, while each lap shows the duration of one segment.
For fair comparisons, start every run from the same condition and record laps at the same checkpoint. If you are timing a fixed countdown rather than measuring elapsed time, use the countdown timer. For repeated work/rest phases, use the interval timer.
This stopwatch works on all modern devices and browsers — desktops, laptops, tablets, and smartphones. No downloads or accounts required. Just open the page and start timing.