Age Calculator
Calculate exact age from a date of birth, including years, months, weeks, days, total days and the next birthday countdown.
How to use this calculator
- Enter the date of birth.
- Choose today or another date to calculate age on.
- Press calculate to see exact age, total days lived and the next birthday countdown.
Results are based on calendar date calculations and are intended for everyday planning, reminders and personal milestones.
When this age calculator is useful
Use this calculator when you need more than a simple age in years. It breaks the result into years, months and days, then also shows the total days and age in weeks.
It is helpful for birthdays, school forms, family records, personal milestones and any situation where the exact difference between two dates matters.
How the result is calculated
The tool compares the date of birth with the selected calculation date using calendar date logic. Leap years and month lengths are handled by the browser date calculation.
For very formal requirements, such as government documents or legal deadlines, verify the result with the relevant organization.
Frequently asked questions
Can I calculate age on a past or future date?
Yes. Use the “Calculate age on” field to choose any date and the result will be based on that day.
Does the calculator store my birth date?
No. The calculator runs in your browser and the plugin does not store the date you enter.
Why do months and days vary between results?
Calendar months have different lengths, so an exact age in months and days depends on the specific start and end dates.