Age Calculator
Calculate your exact age in years, months, days — and days until your next birthday.
How to use the Age Calculator
Enter a date of birth (and optionally another date) to get an exact age plus totals in months, weeks, days and hours.
Formula
Age = Target date − Birth date (calendar-aware)
Worked example
Someone born on 15 May 1990 turns 36 on 15 May 2026.
Frequently asked questions
How is age calculated exactly?
Full years are counted first, then remaining months, then days — borrowing days from the previous month when needed.
Results are estimates for educational and planning purposes. Always confirm important financial, health or legal decisions with a qualified professional. Last reviewed 2026-09-27.