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V47.1 quality reviewed
Age Calculator
Calculate exact age from a birth date to today or to any reference date. Useful for birthdays, age limits, forms, school years, eligibility checks, and future milestones.
Calculate age
Enter dates to calculate age.
How this age calculation works
The calculator compares the birth date with the selected reference date. It counts completed years first, then remaining months and days.
Basic rule: age in years = reference year − birth year. If the birthday has not happened yet in the reference year, subtract one year.
Common age calculation mistakes
- Using only the calendar year and forgetting whether the birthday has already passed.
- Checking age on the wrong reference date for school, travel, insurance, or eligibility forms.
- Ignoring leap-year birthdays when comparing February 29 dates.
FAQ
Can I calculate age on a future date?
Yes. Choose a future reference date to see how old someone will be on that date.
Does this replace official age checks?
No. It is an educational calculator. Use official documents for legal, immigration, school, or medical decisions.