Age Calculator

About Age Calculator

How to use Age Calculator

1. Enter the date of birth for the person whose age you want to calculate.
2. Check the reference date, and change it when you need an age on a specific day.
3. Review chronological age, Japanese counting age, zodiac sign, constellation, school grade, and graduation year.
4. Change the reference date to find the age on a past or future date.

Benefits of Age Calculator

• You can calculate chronological age, Japanese counting age, zodiac sign, constellation, and graduation year in one place.
• The result shows exact age in years, months, and days for precise form checks.
• Days lived and the countdown to the next birthday are calculated at the same time.
• Changing the reference date lets you check an age on any past or future date.
• Early birth months are considered when showing school-year and graduation-related information.
• Leap years and February 29 birthdays are handled consistently for age calculations.
• Browser-only processing keeps date-of-birth information on your device.