Set the alarm clock for 4:18 am

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::

You can also try the other alarm clocks

Alarm clock for 4:16 am Alarm clock for 4:17 am Alarm clock for 4:19 am Alarm clock for 4:20 am

Going to bed for a 4:18 am alarm

Asleep by 7:03 pm — 6 full sleep cycles, about 9 hours
Asleep by 8:33 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:03 pm — 4 full sleep cycles, about 6 hours

A sleep cycle runs about 90 minutes, and most people take around 15 minutes to drop off. Waking at the end of a cycle feels easier than waking in the middle of one.

4:18 am across the country

Sydney	4:18 am
Brisbane	4:18 am
Adelaide	3:48 am
Perth	2:18 am
Darwin	3:48 am

Times are worked out live in your browser, so daylight saving is already accounted for.

Online alarm clock for 4:18 am

While you watch the clock for the moment to inspect what the storm left behind, set the alarm for 4:18 am and keep a torch and shoes nearby. That gives you a defined time to check whether water has reached the yard, garage or lower doorway, without repeatedly heading outside in the dark. If conditions still look unsafe, 5:00 am is the next natural point to reassess.

Rain on the roof, wind and a running fan can easily cover a browser alarm, so choose a strong volume and test it from where you will be waiting. Place the phone close enough to hear, but away from any damp area. Keep the browser running and the phone awake; otherwise the alarm may remain silent and the flooding check could be missed. A separate phone alarm is a sensible backup if the inspection cannot wait.

Before stepping out at this hour, reduce the screen brightness and avoid staring at a bright display while waiting. A dim, warm-toned screen preserves enough visibility to read 4:18 am without filling the room with glare. Leave the torch within reach, then look away from the screen for a moment before checking dark paths, drains or doorways after the storm.

Common questions

Can I set more than one alarm at a time?

This page is built around a single alarm at a time. For multiple alarms, open a separate tab for each one and set a different time in each, keeping every tab open until it's rung.

Why use a browser alarm instead of my phone's built-in one?

Mainly for reliability against silent mode, do-not-disturb, or a phone left charging out of earshot. It's a useful backup or a desk-based alternative, though it depends on this tab staying open rather than running in the background of your phone.

Is there a cost to use this?

No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.

Will the alarm still ring if I close the browser tab?

No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.