Age Calculator Guides
Calculate exact age, countdowns & date differences to the day.
What Is Chronological Age? (And How to Calculate It)
The meaning of chronological age, how it differs from biological age, and how it's used in school cut-offs, medicine and forms.
How Many Days Until Your Birthday? (And How It's Counted)
How to count down to your next birthday correctly, what weekday it falls on, and fun ways to mark milestone days.
How to Calculate Your Exact Age (Years, Months & Days)
The correct way to work out age in years, months and days — handling leap years and month lengths — plus why simple subtraction gets it wrong.