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.

How to use the online alarm clock

Tradies, nurses on night shift, and anyone driving to the airport before the birds wake up all end up here around 4:18 am. This alarm rings straight from your browser tab at 4:18 am, loud enough to cut through a quiet house, without needing an app or an account first.

Using it is simple: pick a ringtone from the list, press Start, and leave this tab open in your browser. The alarm runs entirely on this page, so closing the browser will stop it from going off. Come back a minute early if you're not sure you trust it yet.

Unlike a phone alarm, this one won't ring if you close the tab, put the computer to sleep, or shut the lid, so it suits a desk, a kitchen bench, or anywhere the device stays powered on and awake. It's free to use and doesn't need an account, but it's not built for unattended overnight use. On a 24-hour clock 4:18 am is written 04:18, and spoken aloud it's eighteen minutes past four at night. Timetables and rosters may show it as 04:18, and handwritten notes as 4.18 am. Setting the alarm to 4:18 am tomorrow morning works the same way: if the time has gone for today, the count runs through to it.

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.