Dates & Time
Age Calculator
Calculate an exact calendar age and see the number of days until the next birthday.
Use MM/DD/YYYY or YYYY-MM-DD.
Defaults to today; edit it anytime.
Exact age
36 years
- Calendar age
- 36 years, 9 months, 0 days
- Total days
- 13,422
- Next birthday
- Friday, January 1, 2027
- Days until birthday
- 92
How to use the Age Calculator
- Enter the date of birth.
- Choose the date on which to calculate age.
- Review the calendar age and totals.
How it works
Calendar subtraction borrows days and months as needed instead of dividing the total number of days by 365.
Formula
Exact age = target date − date of birth (calendar years, months and days)
Example
Someone born January 1, 1990 is 36 years old on January 1, 2026.
Common uses
- Checking age on a specific date
- Birthday countdowns
- Calculating elapsed lifetime days