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Age calculator
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About this tool
Calculate calendar age in complete years, months, and days, plus total days and the next birthday.
Common uses
- Calculate calendar age in complete years, months, and days, plus total days and the next birthday.
- Choose a birth date and an as-of date that is not earlier than birth.
How to use it
- 1.Choose a birth date and an as-of date that is not earlier than birth.
- 2.Read age, elapsed calendar days, and days until the next birthday.
Limits and notes
- Whole-year and month anchors retain the original birth day, clamping it to the destination month’s last valid day. For example January 31 to March 1 in 2026 is one month and one day.
Frequently asked questions
What does this tool do?
Calculate calendar age in complete years, months, and days, plus total days and the next birthday.
What should I check before using the result?
Whole-year and month anchors retain the original birth day, clamping it to the destination month’s last valid day. For example January 31 to March 1 in 2026 is one month and one day.