Set the alarm clock for 4:45 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 4:43 am Alarm clock for 4:44 am Alarm clock for 4:46 am Alarm clock for 4:47 am

Going to bed for a 4:45 am alarm

Asleep by 7:30 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:00 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:30 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.

4:45 am across the country

Sydney	4:45 am
Brisbane	4:45 am
Adelaide	4:15 am
Perth	2:45 am
Darwin	4:15 am

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

How to use the online alarm clock

Newborns don't care what time it is, and neither does an early shift roster. If 4:45 am is when you need to be up and moving, this page will ring at exactly 4:45 am through your browser, giving parents and shift workers one less thing to double-check before they finally shut their eyes.

Choose a sound before you press Start — something like a chime or a classic bell tends to work better than anything too gentle. Once it's running, the countdown happens right here in the browser, which means the tab needs to stay open in the background rather than being closed.

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 4:45 am is written 04:45, and spoken aloud it's quarter to five in the morning. You'll also see it written 4.45 am — a full stop instead of the colon means the same time. Setting the alarm to 4:45 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.