Set the alarm clock for 4:47 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 4:45 am Alarm clock for 4:46 am Alarm clock for 4:48 am Alarm clock for 4:49 am

Going to bed for a 4:47 am alarm

Asleep by 7:32 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:02 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:32 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.

4:47 am across the country

Sydney	4:47 am
Brisbane	4:47 am
Adelaide	4:17 am
Perth	2:47 am
Darwin	4:17 am

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

How to use the online alarm clock

Three in the morning has its own kind of silence, and an alarm for 4:47 am breaks it on purpose. Whether you're catching a pre-dawn flight or grabbing a short nap before a long haul, this tool rings at 4:47 am through your browser so you're not relying on a phone across the room.

Pick whichever sound you're most likely to actually notice, then press Start. The alarm is tied to this browser tab, so it needs to stay open. Minimising the window is fine, but closing the tab or the browser will stop the countdown before it ever rings.

This works well as a second alarm, one that isn't tangled up with phone notifications, do-not-disturb settings, or low battery. It genuinely won't ring if the tab gets closed or the device goes to sleep, so treat it as a backup or a work-desk tool rather than the only alarm for something important. On a 24-hour clock 4:47 am is written 04:47, and spoken aloud it's thirteen minutes to five in the morning. You'll also see it written 4.47 am — a full stop instead of the colon means the same time. Setting the alarm to 4:47 am tomorrow morning works the same way: if the time has gone for today, the count runs through to it.

Common questions

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.

Does the alarm work if my laptop goes to sleep?

Not reliably. If the device sleeps or the screen locks, the browser tab pauses along with it, so the alarm may not fire on time or at all. Adjust your power settings if you're relying on this over a longer stretch.

Do I need to create an account or download anything?

No, there's nothing to sign up for and nothing to install. Pick a time and a sound, press Start, and it runs entirely in this browser tab.