Age Calculator
Calculate your exact age in years, months, days, total weeks, and hours, along with days until your next birthday.
How to Use the Age Calculator
Select your birth date and optionally an "as of" target date. The calculator accounts for leap years and exact month lengths to calculate your precise chronological age.
Formula & Calculation Method
Age = Target Date - Birth Date (taking month lengths and leap years into account)Computes completed full years, remainder months, and remainder days, as well as total cumulative calendar days and next birthday countdown.
Calculation Examples
Standard Age Calculation
Exact 25th birthday
Frequently Asked Questions
Does this age calculator account for leap years?
Yes, calendar leap years (such as February 29) are fully accounted for, providing accurate day and month breakdowns.
Can I calculate how old I will be on a future date?
Yes. You can customize the "Age at the Date of" field to see your exact age on any future or historical milestone.
Is my birth date private?
Yes, completely. The calculation runs entirely inside your browser; your date of birth is never sent to any server.