Age Calculator
Calculate exact age, total days, and time until the next birthday.
● Processed locally in your browser unless the page says otherwise.
Calculation note
Age calculation and birthday countdown
An age calculator uses a date of birth to calculate exact age, total days lived, and time until the next birthday. It is useful for forms, age requirements, registrations, insurance information, and personal milestones.
Exact age usually depends on whether this year’s birthday has already passed. Simply subtracting birth year from current year can overcount age before the birthday.
Formula or logic
- Exact age = Current date - Date of birth
- If this year's birthday has not passed, subtract 1 from the year difference
Example
If someone was born on December 1, 2000 and today is August 7, 2026, the year difference is 26, but the exact age is 25 because the birthday has not occurred yet this year.
Common questions
Is exact age the same as cultural age counting?
Not always. Exact age is based on date of birth, while some cultural age systems use different rules.
How are leap day birthdays handled?
For people born on February 29, non-leap-year handling can vary by region or purpose. Official uses should follow the relevant rule.
Can it count days until the next birthday?
Yes. The tool can calculate the next birthday and the remaining days.