Age Calculator: Calculate Exact Age in Years, Months, and Days
Age calculation seems simple — until you need precision. Legal age verification (18, 21, 65), medical dosage based on exact age, retirement eligibility, or simply knowing exactly how old you are in days — these require more than mental arithmetic. Formly's age calculator provides the exact age to the day.
Try Age Calculator Free →What the Age Calculator Computes
Enter your date of birth and a reference date (defaults to today). The calculator returns: age in years, months, and days; age in total months; age in total weeks; age in total days; the day of the week you were born; and how many days until your next birthday.
Legal Age Verification
For legal purposes — purchasing alcohol, voting, signing contracts, or accessing age-restricted platforms — age must be calculated precisely. The calculator determines whether someone has reached a specific age threshold on a given date, accounting for leap years and month-end edge cases.
Medical and Healthcare Uses
Pediatric medication dosing is often age-dependent. Drug prescriptions, vaccination schedules, and growth charts use exact age in months, not just years. The calculator provides age to the month, which is particularly important for infants and toddlers (e.g., "18 months" rather than "1 year, 6 months").
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Retirement Age Calculations
Retirement eligibility varies by country: USA Social Security is age 62–67 depending on birth year. UK State Pension is 66 (rising to 67 by 2028). India EPF withdraws at 58. Australia superannuation access at 60. The calculator helps determine the exact date you reach retirement eligibility.
Leap Year Handling
Age calculation for people born on February 29 (leap day) requires special handling — they only have a "true" birthday every 4 years. The calculator correctly handles leap year birthdays, defaulting to either February 28 or March 1 (configurable) in non-leap years.
Date Difference Beyond Age
The same date-difference logic calculates the gap between any two dates — project durations, days until an event, time since a deadline. Enter any two dates to find the exact difference in years, months, days, hours, or minutes.
Frequently Asked Questions
How accurate is the age calculation?⌄
The calculator is accurate to the day, correctly handling leap years, month-length variations, and year boundaries.
Can I calculate someone's age on a specific past or future date?⌄
Yes. Change the reference date to any past or future date to calculate age at that point.
Is it free?⌄
Yes. Completely free with no limits.
What happens for people born on February 29?⌄
Leap day birthdays are handled correctly. You can choose whether to count their birthday on Feb 28 or Mar 1 in non-leap years.
Can I calculate the age between two dates (not involving a birthday)?⌄
Yes. Use the Date Difference mode to find the exact gap between any two dates.
Try Age Calculator — It's Free
No signup needed. 5 free uses daily. Pro plan from $9.99/month.
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