Age Calculator
Calculate exact age in years, months, and days from a date of birth. Total days lived, day-of-week born, next birthday countdown, and zodiac sign.
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Enter your birth date to see a full breakdown. The calculation accounts for leap years and varying month lengths.
What is the Age Calculator?
An age calculator works out exact time since a birth date, broken down into years, months, days, total days, total weeks, and total hours. Most people use one to fill out forms that ask for age in months (pediatric milestones), to plan a birthday, or just to see how many days they've been alive.
How to use the Age Calculator
- 1
Pick your date of birth
Use the date input to select the year, month, and day. The picker won't let you pick a future date.
- 2
Read your full age
Years, months, and days appear together, plus totals in days, weeks, and hours.
- 3
Check the day you were born
The day-of-week tile tells you whether your birthday landed on a Monday or a Saturday. Useful for trivia and birth-chart conversations.
- 4
Watch the countdown to your next birthday
The Next Birthday tile shows how many days are left, so you know when to start ordering the cake.
Frequently Asked Questions
How is age calculated?
From your date of birth to today's local date, broken down into completed years, then leftover months, then leftover days. Leap years are handled by JavaScript's Date object, so February 29 birthdays correctly clock a full year on March 1 in non-leap years.
Does it show my zodiac sign?
The Western zodiac sign appears in the sidebar based on your birth month and day. Aries through Pisces, with the standard tropical date ranges (e.g. Aries: Mar 21 to Apr 19).
Can I calculate age between two dates?
The current version compares your birth date to today only. To check age at a past event, enter a birth date that gives the same gap (e.g. for someone's age in 2020, subtract 4 years from their actual birth date and read today's result).