Stopwatch & Timer

How It Works

This page gives you two classic timing tools in one place. The stopwatch counts up from zero in hundredths of a second, with lap times so you can record splits as you go — perfect for runs, workouts, and timed practice. The countdown timer counts down from any time up to 9 hours 59 minutes and plays a clear beep when it reaches zero, so you never have to watch the screen.

Both tools run on your device's clock, so they keep accurate time even if you switch to another tab for a moment. The beep is generated with the Web Audio API, so there is no audio file to load — just make sure your sound is on when you start a countdown.

Worked Example

You are boiling eggs and want them jammy, so you set the timer to 6 minutes 30 seconds and press Start Timer. The display counts down — 06:29, 06:28 — and when it reaches 00:00 it beeps three times. Meanwhile, you time a morning run with the stopwatch: after the first kilometre you press Lap and see 00:05:42.18 — 5 minutes, 42 seconds and 18 hundredths — then keep running while the stopwatch carries on.

How to Use This Tool

For the stopwatch, press Start to begin, Lap to record a split without stopping, Start again to pause, and Reset to clear everything. For the timer, enter minutes and seconds, press Start Timer, and it beeps when the countdown finishes — press it again to pause, or Reset Timer to return to the time you entered.

Tips and Practical Advice

For interval training, use the stopwatch laps to mark each work and rest period instead of restarting it — your lap list becomes a full record of the session. For cooking, set the timer a minute short and check early; you can always add time, but you cannot unboil an egg. And for focused study sessions, try a 25-minute countdown with a 5-minute break between rounds — a simple rhythm that keeps concentration high without burning out.