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Calculate age from birthdate. Shows days until next birthday, zodiac sign, and day of the week.
Enter the birth date of the person whose age you want to calculate.
To calculate age as of a specific date, change the target date. Defaults to today.
Age, days/weeks/months since birth, days until next birthday, Chinese zodiac, and zodiac sign are displayed.
Tap to select from calendar
Age Calculator is an online tool that accurately calculates age from a birth date. Beyond just years, it shows total days, weeks, and months since birth, days until the next birthday, Chinese zodiac, Western zodiac sign, and day of the week born. You can also set a custom target date to calculate age as of any specific date.
Western age counts from 0 at birth and increases by 1 each birthday. East Asian age reckoning counts from 1 at birth and increases by 1 each New Year. This tool calculates Western age, which is standard for legal and official documents.
In non-leap years, the legal birthday is considered February 28 (legally, one ages at midnight before their birthday). This tool accurately calculates age for those born on February 29.
Changing the target date calculates your age as of that specific date. For example, to find your age on April 1 next year, set the target date to April 1 of next year. This is useful for checking school enrollment eligibility.
The Chinese zodiac is calculated from the birth year. The 12 animals (Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig) cycle every 12 years. This tool uses the Gregorian calendar year for calculation.
No, birth dates are processed only in your browser and are never sent to or stored on servers. Your personal information remains secure.