How many days have I been alive?
Enter your birthday to count the days you’ve lived: every ordinary morning, every Sunday, every summer, and every full moon so far.
Your birthday is saved on this device.
You have a different birthday saved, and it hasn’t changed.
You’ve lived
days
Most of them were ordinary days. That’s where a life quietly happens.
- Sundays
- A Sunday comes round every week, quietly offering a slower day.
- Summers
- Long evenings and warm light, the same season coming back around each year.
- Full moons
- Every one of them rose, whether anyone looked up or not.
Milestones
A round number you didn’t have to earn: just the days arriving, one after another.
Nothing to prepare for. It will arrive the way the others did, one ordinary day at a time.
How the days are counted
The days are counted on the calendar, one by one, from your birth date to today, including every 29 February along the way. Dividing your age by 365.25 gets close, but it can be a day out; counting the calendar is exact. The day you were born is day 1 of your life.
Sundays, summers and full moons
Sundays are the real Sundays from the day you were born through today, counting the day you were born if it was a Sunday.
Summers use the definition weather services use: June, July and August north of the equator, and December, January and February south of it. A summer counts if you were alive for any part of it, so a baby born in July has already had one. The switch changes which months count, and it’s remembered on this device.
Full moons are counted with the same calculation as ourmoon phase on my birthday page, which we checked against NASA’s catalog of moon phases.
Milestones
Round numbers come round quietly: your 1,000th day, then every 5,000 days, and every 1,000th Sunday. Your 10,000th day falls a few months after your 27th birthday. They’re shown as dates, the one you last reached and the next.
A life in days
A year is a big, blurry unit. A day is one you can picture: waking up, a meal, a walk, the light going down. Counting in days is a way of noticing how many of those you’ve already had.
What’s saved
Your birthday is only used in your browser. If you choose to remember it, it’s saved on this device so the birthday tools can use it, along with your hemisphere choice. Neither is ever sent to us.