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Exact Age from Date of Birth in Years, Months, and Days Calculator

Precise age from day, month, and year of birth.

Calculates exact age in years, months, and days given the year of birth and the number of days elapsed since the birthday this year.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Age years = floor(days_total / 365.2425); months = floor(remainder/30.44)

In depth

Calculates exact age in years, months, and days given the year of birth and the number of days elapsed since the birthday this year.