How many days until my next birthday?

Enter a birth date and the page will calculate the next valid birthday date from today, then show how many days remain.

What age will I turn on my next birthday?

The result shows the age that the next birthday will mark, along with the date and countdown.

What happens if today is my birthday?

The countdown will show Today, and the next birthday age will match the age reached on the current birthday.

What if I was born on February 29?

For leap-day birthdays, non-leap-year countdowns use the last valid day of February so the next birthday result stays calendar-aware.

Why is this different from the age calculator?

The main age calculator focuses on complete age in years, months, and days. This page focuses only on the next birthday date and the countdown to it.

Next Birthday Calculator

Check the exact date of your next birthday, how many days are left, and how old you will turn. This page is built for birthday countdown intent, not for a full age breakdown.

Enter a birth date

Add one date of birth to see the next birthday date, the number of days remaining from today, and the age that birthday will mark.

Date of birth

Use the full birth date so the next birthday date and countdown stay calendar-accurate.

The calculation runs in your browser. If you copy the link, the selected birth date is included in the URL.

Results update instantly as soon as the birth date changes, so it is easy to check another birthday without reloading.

Next birthday result

See the next birthday date, the days remaining, and the age that birthday will mark.

Add a birth date to start

As soon as a valid birth date is entered, the page will show the next birthday date and the countdown from today.

How this next birthday calculator works

The page compares a date of birth with today, finds the latest completed birthday, then identifies the next valid birthday anniversary and the number of days remaining.

1. Enter the birth date

Start with the full birth date so the page can anchor the birthday month and day correctly.

2. The page checks today's calendar date

It compares the current date with this year's birthday anniversary to decide whether the next birthday is this year or next year.

3. Read the countdown and next birthday age

The result shows the next birthday date, how many days remain, and how old the person will be on that birthday.

When a birthday countdown is useful

This page is narrower than the main age calculator. It answers one specific question: when is the next birthday and how many days are left.

It is useful for party planning, reminders, school or family scheduling, and any task where the next birthday date matters more than a full age breakdown.

The countdown is calendar-based, so it respects real month lengths instead of treating every year as a fixed number of days.

Leap-day birthdays need special handling in non-leap years. This page keeps the countdown tied to the last valid day of February.

References and public sources

These public references support birthday countdown logic, leap-day handling, and checking the next valid birthday anniversary on the calendar.

CDC / NCHS - Age

Defines age as age at last birthday, which supports identifying the latest completed birthday before finding the next one.

NIST - Leap year and leap second

Explains leap-year rules that matter when February 29 birthdays need a valid non-leap-year comparison point.

timeanddate - Duration between two dates

Provides a public reference for counting the remaining calendar days from today to the next valid birthday date.

Next birthday calculator FAQ

How many days until my next birthday?: Enter a birth date and the page will calculate the next valid birthday date from today, then show how many days remain.
What age will I turn on my next birthday?: The result shows the age that the next birthday will mark, along with the date and countdown.
What happens if today is my birthday?: The countdown will show Today, and the next birthday age will match the age reached on the current birthday.
What if I was born on February 29?: For leap-day birthdays, non-leap-year countdowns use the last valid day of February so the next birthday result stays calendar-aware.
Why is this different from the age calculator?: The main age calculator focuses on complete age in years, months, and days. This page focuses only on the next birthday date and the countdown to it.

Related age tools

This page focuses on the next birthday countdown. Nearby tools handle sibling age-gap planning, current age, age on a chosen date, and age gaps without taking over birthday-countdown intent.

Live now

Sibling Age Gap Planner

Plan a future sibling gap by turning the first child's birthday into target conception and birth windows.

Open tool

Live now

Age Calculator

Check the exact current age in years, months, and days.

Open tool

Live now

Age on a Specific Date

See how old someone was or will be on a chosen past or future date.

Open tool

Live now

Age Difference Calculator

Compare two birth dates and calculate the exact age gap.

Open tool