Set the alarm clock for 9:51 am

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

Going to bed for a 9:51 am alarm

  • Asleep by 12:36 am — 6 full sleep cycles, about 9 hours
  • Asleep by 2:06 am — 5 full sleep cycles, about 7 hours
  • Asleep by 3:36 am — 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.

9:51 am across the country

London9:51 am
Birmingham9:51 am
Manchester9:51 am
Glasgow9:51 am
Belfast9:51 am

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

How to use the online alarm clock

As you finish up and head out for a circular walk along a public footpath, an alarm for 9:51 am can mark the moment to leave without repeatedly checking the clock. It gives you a little time to reach the path and settle into your pace before 10:00 am, while keeping the departure tied to the morning plan rather than a vague intention.

For a quiet departure, a gentle tone may be enough if the phone is close by and the room is calm. A more persistent sound suits a noisy kitchen, a busy hallway or a bag being packed at the last minute. The volume needs to be audible without disturbing everyone nearby. A browser alarm cannot sound once it has been closed or the phone has gone to sleep, so the walk may begin later than planned; a separate phone alarm provides a sensible fallback.

Once the route carries you away from nearby streets, the late-morning air may feel different across shaded paths, open fields and damp woodland. Humidity can make a light layer feel warmer than expected, while exposed sections may still catch a cool breeze. Clothing that can be loosened or packed away is useful for a circular route, and a quick look outside before leaving helps with choosing between a light waterproof and a more breathable top.

Common questions

Does the alarm still work if I close the tab?

No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.

What happens if my laptop goes to sleep before 9:51 am?

The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.

Do I need an account or an app?

Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.

Can I change the sound?

Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.