Age Calculator
Calculate your exact age in years, months, weeks and days from your date of birth. Find out how many days until your next birthday too.
How the Age Calculator Works
This calculator computes your exact age by finding the difference between your date of birth and today (or any date you specify). It calculates years, months, and days separately to give you a precise result — not just a rounded number of years.
For example, if you were born on March 15, 1990, and today is September 10, 2025, your age is 35 years, 5 months, and 26 days. The calculator also gives your age expressed as total months, weeks, and days lived — these large numbers often surprise people.
Frequently Asked Questions
How do I calculate my exact age in days?
Multiply your age in years by 365, then add the number of days for any partial year. For more accuracy, also account for leap years (which add an extra day every 4 years). This calculator handles leap years automatically and gives you your precise total day count.
What is the chronological age?
Chronological age is your age measured in calendar time from birth — the most common definition. It is different from biological age (how old your body functions relative to average), mental age (cognitive ability compared to norms), or social age (life stage milestones). This calculator computes chronological age.
Can I calculate someone else's age on a specific date?
Yes — enter their date of birth in the first field, then enter the target date in the second field. This is useful for historical research, legal calculations (such as the age of a person at a specific event), or planning future celebrations.