Birthday Countdown: How Many Days Until My Birthday?

Pick a birthday above and the counter shows exactly how many days are left, ticking down to the hour. Add everyone in the family and you get the whole year at a glance.

There's no sign-up and nothing gets uploaded — the countdown lives in the link and in your own browser, so you can bookmark it, put it on your phone's home screen, or paste it into the family group chat.

How many days until my birthday?

Count from today to your next birthday. If it's already been this year, you're counting to next year's — which is why the number can jump from 1 to 364 overnight.

The counter above does this for you, but the arithmetic that trips people up is the year boundary: from 20 August to 15 March is 207 days, not the 158 you'd get by subtracting the dates and ignoring the year change.

Adding the whole family

You're not limited to one. Add a birthday, then add another — everyone stacks up in the same countdown, sorted so the next one coming is always the big number at the top.

That's the point at which it stops being a countdown and starts being a calendar, which is rather the idea.

A full screen birthday countdown timer

Press Open full screen and the page strips down to just the numbers — no menu, no footer, no explanation. The digits scale to fill whatever they're on, so the same view works on a phone propped against the kettle, a spare monitor, or a TV across the room.

This is the bit people usually want for a party. Put it on the big screen an hour before guests arrive and the countdown does the announcing for you. For a child counting sleeps, an old tablet on a shelf in their room does the job — it costs nothing and it answers the question without anybody being asked.

The full screen view reads its birthdays from the link, so it needs no app and no sign-in. Open the link on any device and you get the same countdown, ticking from that device's own clock.

Sharing a countdown

Every countdown you build gets its own link, and that link opens straight into the full screen view. Copy it and whoever opens it sees exactly what you see.

The link holds the names and dates, so nothing is stored on our end and nothing expires. A countdown you share today still works next year — it'll just be counting to the next birthday.

If you'd rather not put a birth year in a shared link, leave the year blank. You'll still get the countdown, just without the "turning 12" line.

What about 29 February?

Leap-day birthdays get counted properly here, which is more than a lot of countdown tools manage — plenty of them either crash or quietly skip to 1 March.

In a leap year the countdown runs to 29 February. In every other year it runs to 28 February, so the number hits zero in the month the family actually celebrates. That's also the convention most countries use for legal purposes.

Questions

Is this birthday countdown free? Yes, and there's no account. It's a small tool from DinkyDash, our open-source family calendar.

Does the countdown keep running if I close the tab? It picks up where it left off. Your countdowns are saved in your own browser, so the page remembers them next time. Clearing your browser data clears them too — keep the link if you want a permanent copy.

Can I count down to something that isn't a birthday? Anything that happens on the same date every year works: anniversaries, holidays, the last day of school. Put the name in the name field and it'll count down all the same.

How many birthdays can I add? As many as you like. Past three or four the list is more useful than the big number, which is roughly the point at which you might want it on a screen instead of in a browser tab.

Why does it say 364 days and not 365? Because it counts whole days from today. The day after your birthday, there are 364 sleeps until the next one — 365 in a leap year, or if a 29 February falls in between.

Does the birthday countdown work offline? Once the page has loaded, yes. All the arithmetic happens in your browser.

Can I put the birthday countdown on a TV full screen? Yes. Open full screen strips the page down to just the numbers, sized to fill whatever screen it's on, so it works on a TV, a spare monitor or an old tablet. The link holds the birthdays, so opening it on another device shows the same countdown.

Every birthday, on the kitchen wall

A browser tab is a fine place for one countdown. It's a bad place for the eight your family actually cares about — nobody opens a tab to find out whose birthday is coming up.

That's what DinkyDash is for. It's a free, open-source family dashboard that turns any old tablet, spare monitor or Raspberry Pi into a screen on the kitchen wall showing today's calendar events, a chore chart that rotates between the kids, every birthday countdown, and a short daily brief written fresh each morning.

It's the same countdowns you just made, somewhere the family will actually see them.

Last updated 2026-09-03.