alarm-clock.org

Online Stopwatch

A clean, free stopwatch with lap times. Press Start (or the spacebar) to begin.

00:00.00

How the stopwatch works

This is a precise, browser-based stopwatch — nothing to install. Click Start to begin timing and Stop to pause; the display keeps hundredths of a second. Hit Lap to record a split without stopping the clock — each lap shows both the lap time and the total elapsed time, newest at the top. Reset clears everything back to zero.

Keyboard shortcuts: Space start/stop · L lap · R reset. Use Full screen for a big, room-visible display — handy for workouts, classrooms, science experiments, cooking and games.

Need to count down to a length of time instead? Use the online timer. Counting down to a date or event? Make a countdown.

💡 How do we make Alarm-Clock.org better? Share an idea →

Alarm-Clock.org is new, and we want it to be the best countdown, reminder, and event site online. If you have an idea to make it better, we'd love to hear it.

Every suggestion is read and reviewed. We can't promise to act on them all, but they directly shape what we build next.