Age Calculator is a free browser-based tool for working out calendar age from a date of birth and a chosen calculation date. It provides age in years, months, and days, along with totals such as days and weeks.
General and baby age formats
The calculator also offers baby and toddler display formats, including weeks and days. It uses calendar dates rather than treating every month as a fixed number of days. Leap days and month lengths are handled as part of the calculation.
How to use it
- Choose the general or baby calculator.
- Enter a date of birth and the date to calculate age as of.
- Select a display format if using the baby calculator, then calculate.
Not medical advice
This tool is for general informational use only. It does not assess health, growth, or development, and it is not a substitute for advice from a qualified healthcare professional.