Enter the details
Use a full birth date for the most precise age, or enter a completed age for a birth-year estimate.
Free age calculator
Calculate Your Age
Enter a birth date to calculate your age today, or use the second calculator to estimate what year you were born. Both calculations run privately in your browser.
Age in years, months & daysBirth-year estimateNo account needed
Calculate your age
Choose your date of birth and an “as of” date.
What year was I born?
Enter your age and choose the year you want to use.
Find an age or calculate a birth year in three steps
Choose the reference date
Age changes on a birthday, so you can calculate for today or for a different date.
Read the result
Get years, months and days, or a likely birth-year range when the birthday is unknown.
Age calculator frequently asked questions
How does this tool calculate your age?
It compares the calendar date of birth with the reference date, then counts complete years, remaining months and remaining days.
Can I calculate my age on a past or future date?
Yes. Change the “calculate as of” date to see the age on a specific event, anniversary or planning date.
What year was I born if I am a certain age?
Subtract the age from the reference year for a starting estimate. Because the birthday may or may not have happened yet in that year, the precise answer can span two birth years.
Does the calculator account for leap years?
Yes. It uses calendar date values, including February 29 in leap years. A person born on February 29 may use a different observed birthday in non-leap years depending on the policy involved.
Is the birth-year result exact?
It is exact only when the age is measured on or after the person’s birthday in the reference year. Without the month and day, the tool provides the two possible years.
Is my date of birth saved?
No. The calculator runs in your browser and does not create an account or save the dates and ages you enter.
Useful answers for birthdays, school years and family plans
To calculate your age accurately, use your full date of birth rather than only a birth year. That lets the tool account for whether your birthday has already occurred on the reference date.
If you need to calculate birth year from age, an age alone often gives two possible answers. Someone who is 32 in 2026 may have been born in 1993 or 1994, depending on whether their birthday has happened yet.
“What year was I born?” is a useful planning question, but it is not a substitute for identity, eligibility, medical, legal, pension or school-enrollment records. Use the original record whenever a formal date is required.
Once you have the right date, add birthdays and milestones to your shared family schedule so the people who need to plan around them can stay in sync.
How this calculator works—and its limits
Method: OneFamli compares Gregorian calendar dates in your browser and never sends the entered birth date to our servers. Birth-year estimates: an age without a birthday can describe two possible years, which the tool shows rather than guessing. Scope: this is for everyday planning, not proof of age or official eligibility. Learn more about OneFamli or contact us with a question or correction.