Age Calculator
Find out your exact age in years, months and days on any reference date, plus how long until your next birthday - leap years handled correctly.
Updated September 2026 · Written and verified by Akash Pandey
Age Calculator
How to use the age calculator
- Enter your date of birth.
- The "as of" date defaults to today but can be changed to any date.
- Results show years, months and days, total days lived, and days until the next birthday.
Frequently asked questions
How is calendar age calculated?
By calendar-year/month/day arithmetic, not 365.25-based estimates: someone born on Feb 29 turns one full year old on the following Feb 28 in non-leap years, matching legal and medical practice.
Why does this matter for legal age?
Legal age in most countries is calendar-based, so exact year/month/day arithmetic (not decimal years) is what determines whether 17 years 11 months means seniority or not.
Can I calculate age at a past date?
Yes - change the "as of" date to any past or future date and the age recalculates.
How are leap years handled?
February 29 birthdays are handled per standard convention: the annual anniversary falls on Feb 28 in non-leap years, and total days use the real calendar.
Does it work for dates before 1970?
Yes - the calculator accepts any valid date the input allows.
Is it private?
Yes - dates are processed locally and never stored.
Does the age calculator count leap years correctly?
Yes. The algorithm checks every calendar year in the range and accounts for February 29 leap days precisely.
Can I calculate my age on a future or past date?
Yes. You can select any target date in the past or future to determine your exact age at that point in time.