Online Stopwatch (chronometer) to mark time intervals. You can use it in several different situations.
Counts in milliseconds the time passed after you click the Start button.
Press "Lap" or (L) while the stopwatch is running to record split times.
Monitor elapsed time while working in other programs, IDEs, or spreadsheets with live interactive buttons.
Project large, high-visibility digits across gyms, auditoriums, and testing centers.
Hit Space to Start/Pause, Backspace to Reset, Enter for Fullscreen, and Shift+P for Floating PiP.
Accurate browser-based counter updated continuously with no background freeze.
Benchmark and measure athletic splits, cognitive speed, and professional work with exact precision.
| Application & Activity | Timing Resolution | Practical Benefit |
|---|---|---|
| Athletics, Track & Swimming Laps | Milliseconds (0.001s) | Capture microscopic split differences and explosive athletic reaction times. |
| Speedcubing & Puzzle Solving | Hundredths & Milliseconds | Record official competition benchmarks and celebrate personal speed records. |
| Professional Time Tracking & Billable Hours | Seconds & Minutes | Audit exact working hours dedicated to client projects and development sprints. |
| Speeches, Pitches & Classroom Presentations | Seconds | Keep keynotes tightly scheduled and ensure presenters respect designated time limits. |
Yes. Elapsed time is calculated using absolute system timestamps, meaning time continues ticking accurately even when your browser tab is in the background.
Click the 'Picture-in-Picture' button or press Shift+P. A floating window appears on top of your screen with Start, Pause, and Reset buttons.
Spacebar toggles Start and Pause, Backspace resets the clock to zero, Enter toggles Full Screen, and Shift+P triggers the Picture-in-Picture window.
Yes! The huge, high-contrast numbers and full screen mode are specifically designed for sports coaches, fitness trainers, and athletes.
There is no limit. The stopwatch can track continuous time from fractions of a second up to dozens of consecutive hours.
