Set the alarm clock for 3:13 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 3:11 am Alarm clock for 3:12 am Alarm clock for 3:14 am Alarm clock for 3:15 am

Going to bed for a 3:13 am alarm

Asleep by 5:58 pm — 6 full sleep cycles, about 9 hours
Asleep by 7:28 pm — 5 full sleep cycles, about 7 hours
Asleep by 8:58 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.

3:13 am across the country

Sydney	3:13 am
Brisbane	3:13 am
Adelaide	2:43 am
Perth	1:13 am
Darwin	2:43 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 3:13 am is when you need to be up and moving, this page will ring at exactly 3:13 am through your browser, giving parents and shift workers one less thing to double-check before they finally shut their eyes.

Start by selecting a tone from the dropdown, then hit Start to lock it in. From that point the page does the counting, and it'll ring once the time is reached, but only if the tab is still open somewhere on your device. Closing it, or the browser entirely, cancels the alarm.

A browser alarm like this one is handy when your phone's on silent, charging in another room, or you just don't want to unlock it and get pulled into notifications. The trade-off is honesty: it only rings while this tab stays open, so it's not a replacement for your phone alarm on a trip where the laptop lid might close. On a 24-hour clock 3:13 am is written 03:13, and spoken aloud it's thirteen minutes past three at night. Timetables and rosters may show it as 03:13, and handwritten notes as 3.13 am. Setting the alarm to 3:13 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.