DateOfBirth.org

How to calculate your age from your date of birth?

Select your date of birth. On a phone this opens the native calendar, so there is nothing to type and no risk of swapping the day and month. Read your age. It appears the moment a valid date is chosen — no button, no waiting. Optional — a specific date. Switch on “a specific date” to find out how old you were on a past day (a wedding, an exam, a historical event) or how old you will be on a future one.

What is chronological age?

Chronological age is the amount of time that has passed since the day you were born, and it is exactly what this tool measures. It is the age used for school placement, voting and driving eligibility, retirement thresholds, insurance and almost every legal or official purpose.

How old was I on a past or future date?

Turn on “a specific date” and the calculator stops using today and uses the date you choose instead. This answers questions like “how old was I when this photo was taken?”, “how old will I be in 2030?”, or “how old was a historical figure on a particular day?”. The shareable link carries both dates, so you can send someone the exact calculation rather than describing it.