How age is calculated

This calculator finds the exact span between a date of birth and any reference date, broken down into full years, months, and days rather than a single rounded number. It also totals up how many days, weeks, and hours have passed since birth, identifies the day of the week someone was born on, and counts down to the next birthday.

Common uses

• Checking exact age for eligibility, forms, or legal purposes
• Finding out how many days are left until a birthday
• Calculating age as of a past or future date, not just today