Set 18 Hours Timer - Free Online Countdown Clock

Set 18 Hours Timer Online

Set timer for 18 Hours directly in your browser. This free online countdown clock counts down from 18 hours to zero and plays a loud alarm when time is up. To start the timer, simply click the Start button above.

Popular Uses

18:6 Intermittent Fasting - fast for 18 hours and eat within a 6-hour window for accelerated fat loss and cellular autophagy.
No-Knead Bread Fermentation - mix no-knead dough in the evening and let it ferment at room temperature for 18 hours overnight.
24-Hour Hackathon Phase - track the first 18 hours of a hackathon and know when to transition into final testing and polish.
Cross-Pacific Flight - some of the longest commercial flights — like Dallas to Sydney — run close to 18 hours gate-to-gate.
Final Sprint Countdown - count down 18 hours to a critical deadline from the moment you start your last focused push.

Frequently Asked Questions

Does this 18 hours timer make a sound?

Yes. When the countdown reaches zero, the browser plays a short alarm chime. Keep the tab open and your device volume enabled.

Can I use this timer in full screen?

Yes. Use the full-screen button to turn the countdown into a large display for classrooms, workouts, meetings, cooking, or livestreams.

How many seconds is this timer?

This countdown is exactly 64,800 seconds long.

More Timer Durations

Need a different time? Select from our quick preset timers below.

Seconds:

1 Second Timer 2 Second Timer 3 Second Timer 5 Second Timer 10 Second Timer 15 Second Timer 20 Second Timer 25 Second Timer 30 Second Timer 35 Second Timer 40 Second Timer 45 Second Timer 50 Second Timer 60 Second Timer 90 Second Timer

Minutes:

1 Minute Timer 2 Minute Timer 3 Minute Timer 5 Minute Timer 10 Minute Timer 15 Minute Timer 20 Minute Timer 25 Minute Timer 30 Minute Timer 35 Minute Timer 40 Minute Timer 45 Minute Timer 50 Minute Timer 60 Minute Timer 90 Minute Timer

Hours:

1 Hour Timer 2 Hour Timer 3 Hour Timer 4 Hour Timer 5 Hour Timer 6 Hour Timer 7 Hour Timer 8 Hour Timer 9 Hour Timer 10 Hour Timer 11 Hour Timer 12 Hour Timer 13 Hour Timer 14 Hour Timer 15 Hour Timer 16 Hour Timer 18 Hour Timer 24 Hour Timer 48 Hour Timer 72 Hour Timer