Age Calculator

Use AixKit's free Age Calculator to calculate exact age in years, months, and days from date of birth, check age on a specific date, and find time until the ...

Date of Birth:

Age at the Date of:

How to Use the Age Calculator

Enter your date of birth using the month, day, and year fields.

To calculate age on a specific date, fill in the Age at the Date of fields — leave blank for today.

Results appear automatically showing years, months, days, and total time breakdown.

Click Copy or Download to save the result for use in forms or records.

What Makes This Calculator Different

Shows total time lived — results include total days, hours, minutes, and seconds, not just years

Custom target dates — calculate age on any past or future date, not only today

Leap year handling — February 29 birthdays are computed automatically per standard calendar convention

Calendar-based precision — uses actual month lengths, not fixed 30-day approximations

How Age Is Calculated

Full years: complete 12-month periods elapsed since the date of birth

Remaining months: calendar months since the last birthday, using actual month lengths (28–31 days)

Remaining days: calendar days after full months are counted — count varies by which month the last birthday fell in

Leap years: February 29 birthdays are treated as March 1 in non-leap years, consistent with most legal and administrative standards internationally

Important Note

Results are based on standard Gregorian calendar calculations. Minor differences may occur depending on local date conventions or jurisdiction-specific rules for edge cases such as leap-day birthdays. This calculator is a reference tool — verify with relevant authorities when age is required for legal or medical purposes.

Frequently Asked Questions

How accurate is this calculator? +

Can I calculate age on a past or future date? +

Does it include leap years? +

Why do months and days vary from what I expect? +

Can I use this for official forms? +

How is total days calculated? +