How do I use an online stopwatch with lap times?+
Click 'Start' to begin timing, then click 'Lap' to record split times without stopping. Each lap shows the split time and cumulative time. Click 'Stop' to pause and 'Reset' to clear.
How accurate is an online stopwatch?+
This stopwatch uses the browser's requestAnimationFrame API (linked to your display refresh rate), making it accurate to within 1-2 milliseconds, precise enough for most timing needs.
Can I use this as a countdown timer?+
Yes. Switch to Timer mode, enter your desired time (e.g., 25:00 for 25 minutes), and click Start. An audio alert will play when the countdown reaches zero.
Does the timer work in the background?+
Yes. The countdown is mirrored in the browser tab title so you can track it from another tab, and when it reaches zero it plays an alarm and (with permission) sends a desktop notification. Browsers throttle background JavaScript slightly, so for split-second accuracy keep the tab active or use fullscreen mode.
Can I loop the timer for interval training?+
Yes. Turn on the loop toggle in Timer mode and the countdown restarts automatically each time it hits zero, perfect for HIIT, Tabata, and repeating work/break intervals. Combine it with fullscreen mode for a big, room-visible clock.
Can I use this stopwatch for exercise intervals?+
Yes. The lap function is perfect for tracking interval training, record each set or round and compare your split times. The tool automatically highlights your fastest lap in green and slowest in red so trends are obvious at a glance.
Can I use this timer on my phone or tablet?+
Yes. The timer and stopwatch work on any modern mobile browser, iOS Safari and Android Chrome both support it fully. The interface is touch-friendly for tap-based lap recording and start/stop control.
How do I set a timer for a specific number of minutes?+
Enter the minutes (and seconds or hours) and start; the countdown runs and sounds an alarm when it reaches zero. Switch to stopwatch mode to count up with lap times.
Does the alarm sound if the tab is in the background?+
Yes. The timer keeps running and the alarm plays even when the tab is in the background, so you will not miss it while working elsewhere.
Is there a full-screen mode for classrooms or presentations?+
Yes. Expand to full screen so a countdown is visible across a room, useful for classrooms, workshops and timed activities.
Does the timer keep running in the background?+
Yes: it tracks elapsed time accurately even when the tab isn't in focus, and the alarm still fires.
How accurate is it?+
It's millisecond-accurate, using the browser's high-resolution timing rather than rounding to whole seconds.
