Precision Stopwatch
Track elapsed time with millisecond precision. Perfect for workouts, experiments, and competitive timing.
A stopwatch measures how much time has passed since you pressed start, counting up rather than down. Unlike timers, there is no preset duration. You decide when to start and when to stop, and the stopwatch just tracks the elapsed time with high precision. This one updates hundreds of times per second so you never miss a split.
The lap feature is where things get interesting. Hit the lap button while the stopwatch is running, and it records a checkpoint without stopping the overall count. This lets you compare segment times, see which intervals were faster or slower, and analyze performance in detail. Marathon runners, gym-goers, and scientists all use laps for the same reason: to break a long run into measurable chunks.
What This Stopwatch Offers
Millisecond Precision
Uses requestAnimationFrame for smooth, high-resolution timing that displays centiseconds (hundredths of a second).
Lap Timing
Record unlimited lap times while the stopwatch keeps running. Compare each segment against the total.
Fullscreen Mode
Expand to fullscreen for large display timing. Perfect for race events, presentations, or gym classes.
Keyboard Shortcuts
Space to start/pause, L to record a lap, R to reset. Works without clicking anything.
Common Uses for a Stopwatch
Running & Cycling
Track your pace per kilometer or mile by recording laps at each marker. Compare workout to workout over time.
HIIT Workouts
Time your work intervals and rest periods manually, or use laps to track each round in circuit training.
Photography
Time long exposure shots, light trail photography, or track how long image processing takes on your computer.
Speedcubing & Puzzles
Time how fast you solve a Rubik's cube or other puzzles. Competitive speedcubers track their times to measure progress.