Calculator
Age Calculator
Calculate exact age in years, months, and days. Includes a next-birthday countdown and a two-person comparison.
Age from date of birth
Age (years / months / days)
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Next birthday in
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Day of week born
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Age difference between two people
Difference (years / months / days)
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Older
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Total days apart
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How old am I, exactly?
Counting age is more nuanced than it looks. Months are different lengths, leap years add an extra day every four years, and a birthday on Feb 29 only happens about once every four trips around the sun. Our calculator follows the standard convention: complete years are counted first, then complete months, then the remaining days — using real calendar rules so the answer matches what official forms expect.
Use the “calculate age on” field for forward-looking questions: school admission cutoffs, retirement eligibility, anniversaries, or just checking how old you'll be on a specific milestone date.