How to get an exact age in under a minute
Enter the birth date, leave the as-of date blank to compare against today, and press Calculate. The result is the exact age in whole years, months, and days — not a decimal like 36.5 — because it is measured against the real calendar: a birth on May 15 shown on August 11 reads 36 years, 2 months, 27 days. Use the as-of field when you need an age on a specific past or future date, such as a contract anniversary, an eligibility cutoff, or a historical record; the calculator accepts any reference date as long as it is not before the birth date.
The three fields are the whole interaction, and every number is computed locally in your browser — dates you type are never sent to a server. If the result looks wrong, check the obvious first: the day of birth is not counted as day one, so a child born today is 0 days old, and a birthday on the 31st never creates phantom months because real month lengths are respected.