Age Calculator

Calculate age in years, months, and days from a date of birth to a selected date. The comparison date defaults to today.

How age is calculated

The calculator counts complete calendar years and months from the birth date, then shows the remaining days. For a February 29 birthday, it uses February 28 in non-leap years.

{
  "calculator": "age-calculator",
  "input_labels": [
    "Date of birth",
    "Age on this date"
  ],
  "title": "Age",
  "category": "Dates",
  "op_label": "Age",
  "explanation": "Calculate age in years, months, and days from a date of birth to a selected date. The comparison date defaults to today.",
  "template": "calculator_dates"
}