About the Age Calculator
Calculate Age in Years, Months and Days — Find age as of a chosen date, including completed years, remaining months and days, total days lived and approximate days until the next birthday.
Formula or method
Date differences use calendar components in UTC so clock changes and daylight saving time do not affect dates.
Worked example
Born 20 May 1995, as of 2 November 2026: 31 years and 5 months (plus the remaining days).
How to use the tool
- Choose a date of birth.
- Set the date you want to calculate age on.
- Read calendar age and total days.
Common uses
Birthday planning, form preparation, age checks.
Assumptions and limitations
The calculator supports birth and reference dates from 1900 through 2200. Leap-day birthdays and the definition of the next birthday may vary by local law and culture.
Frequently asked questions
Does the Age Calculator include the time of day?
No. It compares calendar dates, not times of birth or time zones.
Privacy and support
Your inputs are processed locally in your browser. ToolMosaic does not upload or store the values you enter in this tool. Our tools are free, and we appreciate your support.