Online Stopwatch — High-Precision Lap Timer with Milliseconds
An online stopwatch measures elapsed time with high precision (down to milliseconds) from the moment you click Start. It includes split lap recording to track multiple checkpoints without interrupting the main timer.
How to Use
-
Click Start
Click the Start button to begin timing. The digital readout displays HH:MM:SS with millisecond precision.
-
Record Laps
Click Lap while running to record individual split times and total elapsed milestones.
-
Pause, Copy or Reset
Pause at any point, copy your lap table to the clipboard, or reset the timer back to zero.
High-Accuracy Performance Timing
Using the high-resolution performance.now() browser clock, this stopwatch prevents CPU throttling drift, delivering reliable timing for workouts, study sprints, speedrunning, and cooking.
Who Uses This
Fitness & HIIT Intervals
Time running laps, plank holds, sprint intervals, and circuit workout sets.
Speedrunning & Gaming
Benchmark game load times, speedrun segments, and challenge splits.
Productivity & Pomodoro
Track deep work sprint sessions and evaluate task completion speed.
Cooking & Brewing
Time coffee extractions, baking intervals, and tea steeping times.