GUIDE
How to use this calculator
Use this online stopwatch to measure elapsed time for workouts, study drills, presentations, experiments, games, or repeated tasks. Timing is calculated from the browser's monotonic clock, so the displayed total is based on real elapsed time instead of assuming every screen update happens on schedule.
What is the difference between lap and split time?
Lap time measures the interval since the previous lap. Split time is the total elapsed time since the stopwatch started.
Does the stopwatch keep accurate time in another tab?
Screen updates may slow in an inactive tab, but Hypercalcs derives the elapsed total from the browser clock when the page updates again.
Are my stopwatch laps saved?
No. Elapsed time and laps remain in the current browser page and are cleared when you reset or leave the session.
