Birthday Calculator — days until your next birthday

How it works

Your next birthday is simply the next occurrence of your birth month and day:

days until = next birthday − today

If this year's birthday hasn't happened yet, that's the next one; if it has, the next one is next year. The age you'll turn is the year of that birthday minus your birth year. The count is in whole calendar days, so month lengths and leap years are handled automatically.

A February 29 birthday is the special case: in a common year there is no February 29, so this calculator places the birthday on February 28 (the same end-of-February convention the age calculation uses); in a leap year it falls on the real February 29.

Worked example

Someone born June 15, 1990 counting from January 1, 2026 turns 36 on June 15, 2026, which is 106 days away. Counting from a date after June 15, the next birthday rolls to 2026 → 2027. A leap-day baby born February 29, 2000 turns 27 on February 28, 2027 (a common year), but on the real February 29 in leap years.

Frequently asked questions

How many days until my birthday?

Subtract today from your next birthday: days until = next birthday − today. The next birthday is this year's if it hasn't passed, otherwise next year's. Someone born June 15 counting from January 1, 2026 has 106 days to go.

What age will I turn?

The age you'll turn is the year of your next birthday minus your birth year — one more than your current age. The calculator shows it alongside the days remaining and the birthday's date.

Does it count from today automatically?

Yes — the "count from" date defaults to today, so it shows the days until your next birthday right now. You can set it to another date to count from then instead.

When is a February 29 birthday celebrated?

This calculator places a leap-day birthday on February 28 in common years and on February 29 in leap years, matching how the age calculation treats the end of February. Some people mark it on March 1 instead — a matter of convention.

How is the age different from my current age?

Your current age is how old you are today; the "turning" figure is how old you'll be on your next birthday — one year more. See the age calculator for your exact current age in years, months and days.

Does it include the birthday itself?

On your birthday the count is 0 days and it shows the age you turn that day. The day after, it counts down to next year's birthday.