Birthday profile and celebration planner

Birthday Calculator

Turn a birth date into a colorful birthday profile with a live countdown, calendar milestones, traditional symbols and practical celebration tools.

Create a birthday profile

Enter a birth date and choose the date from which the birthday details should be calculated.

Your birthday passport

Exact age–

Next birthday–

Age on next birthday–

Days until birthday–

Live birthday countdown

–days

–hours

–minutes

–seconds

The live countdown is shown when the comparison date is today.

Birthday-year progress

Progress from the previous birthday to the next one.

Birthday symbols and calendar facts

Western zodiac–

Chinese zodiac–

Traditional birthstone–

Traditional birth flower–

Birth season–

Born on–

Day of the year–

ISO week of the year–

Born in a leap year–

Zodiac signs, birthstones and birth flowers are traditional cultural associations presented for entertainment, not scientific conclusions.

Birthday timeline and special milestones

Discover your golden birthday, next half birthday and memorable day-count anniversaries.

Golden birthday–The birthday when your age matches the day of the month on which you were born.

Next half birthday–

Next 1,000-day milestone–

Add the next birthday to your calendar

Download a private calendar event for the next birthday. The file is created in your browser and is not uploaded.

Create a shareable birthday card

Download a colorful image with the countdown and birthday symbols. The original birth date is not printed on the card.

Mini birthday party planner

Estimate cake portions, pizzas and non-alcoholic drinks. Adjust the result for appetites, dietary needs and local serving sizes.

Total guests

Children included

Party duration in hours

Cake portions including a 10% buffer–

Suggested cake size–

Approximate large pizzas–

Approximate non-alcoholic drinks–

Planning estimates only. Confirm portions with the bakery or caterer and offer suitable alternatives for allergies and dietary needs.

How the birthday calculations work

Calendar years, real month lengths and leap years are used. February 29 anniversaries use February 28 in non-leap years.

Your dates stay in your browser

All calculations, the calendar file and the birthday card are created locally. The birth date is not added to shared text or the downloadable card.

Birthday Calculator FAQ

How is the next birthday calculated?

The birth month and day are placed in the comparison year. If that date has passed, the calculator uses the following year.

How does the calculator handle a February 29 birthday?

In a non-leap year, February 28 is used as the birthday anniversary for calendar calculations.

What is a golden birthday?

It is the birthday on which your age equals your birth day number. Someone born on the 18th has a golden birthday at age 18.

Is the Chinese zodiac accurate around Lunar New Year?

The calculator uses the browser’s Chinese calendar year when available, so January and February dates follow the Lunar New Year boundary.

Are birthstones, flowers and zodiac signs scientific?

No. They are traditional cultural associations included as birthday entertainment.

Does the site save my birth date?

No. The calculator runs locally in the browser and does not need to save the entered birth date.