Set the alarm clock for 5:03 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 5:01 am Alarm clock for 5:02 am Alarm clock for 5:04 am Alarm clock for 5:05 am

Going to bed for a 5:03 am alarm

Asleep by 7:48 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:18 pm — 5 full sleep cycles, about 7 hours
Asleep by 10:48 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.

5:03 am across the country

Sydney	5:03 am
Brisbane	5:03 am
Adelaide	4:33 am
Perth	3:03 am
Darwin	4:33 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 5:03 am is when you need to be up and moving, this page will ring at exactly 5:03 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 5:03 am is written 05:03, and spoken aloud it's three minutes past five in the morning. Timetables and rosters may show it as 05:03, and handwritten notes as 5.03 am. Whether you would say set alarm for 5:03 am or put an alarm on for 5:03 am, the steps are the same: pick a sound, press Start, leave the tab open.

Common questions

Can I change the alarm sound?

Yes, there's a short list of tones to choose from before you press Start. Pick whichever one you're most likely to actually hear — softer sounds are easier to sleep through than a firm chime or bell.

What happens once the alarm goes off?

It rings through your device's speakers on a loop until you stop it from this page. There's no separate app notification, so make sure your volume is turned up before you rely on it.

Is this alarm accurate across daylight saving time?

It uses your device's local clock, so as long as your computer's time and date settings are correct, it'll adjust automatically when daylight saving time starts or ends.

Can I use this on my phone instead of a laptop?

Yes, it works in a mobile browser the same way, but phones are more likely to lock the screen or sleep, which can stop the alarm from ringing. A laptop or desktop tends to be more reliable for this.