Age Calculator
Calculate exact age in years, months, and days.
Calculate exact age in years, months, and days.
How to use Age Calculator
Calculate exact age in years, months, and days.
- Select the settings and calculation mode that match your task.
- Enter your own values in the labelled fields; use consistent units and dates.
- Calculate, review the breakdown and correct any flagged inputs before using the result.
Formula and calculation method
Calendar age is the difference between date of birth and the selected cutoff date in completed years, months and days.
Use the result breakdown to check the inputs and understand which factors changed the outcome.
Check before using the result
Check input units, dates and the selected rule or policy. A valid mathematical calculation does not replace the applicable institution’s rules.
Frequently asked questions
How does Age Calculator calculate the result?
Calendar age is the difference between date of birth and the selected cutoff date in completed years, months and days.
Which settings should I use?
Choose the scale, dates, units and rule that match your records. Where a custom mode is provided, enter the values from your applicable policy instead of assuming the example preset applies.
Can I use the result for an official decision?
Use the result to plan and check your figures. Confirm official requirements, records or quotations with the relevant institution.