Age Calculator
Calculate age in years, months, and total months.
Inputs
Age Calculator
Results update as you type.
Live result
Age years
36
Extra months
2
Total months
434
Scenario compare
Save scenario A, change a few inputs, then save scenario B.
Scenario A
Not saved yet
Scenario B
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Quick check
Change one or two inputs to compare a second scenario before using the number.
Need more detail?
Formula, examples, and FAQ stay tucked away until you need them.
FXFormula ExplanationThe core logic behind the numbers on this page.+
The age calculator works by comparing the full calendar years and months between the two dates. It takes into account the exact dates of birth and the current date, ensuring an accurate calculation. The result is displayed in years and months, providing a clear understanding of the age difference.
USEHow to UseA short path from input to result.+
- Enter the birth year, month, and day.
- Enter the as-of year, month, and day.
- Review age in years and months.
EXExamplesReference scenarios to sanity-check your inputs.+
Example: From 1990-01-15 to 2026-04-12 is 36 years and 2 months.
FAQFAQCommon edge cases and quick clarifications.+
How does the age calculator work?
The age calculator compares the full calendar years and months between the two dates to calculate the age in years and months.
Can I use today's date automatically?
No, this demo uses an editable as-of date so the result is predictable and easy to test.
Why are days not shown in the result?
The current result focuses on years and months. A day-level result can be added with the same schema.
What if I enter an invalid date?
The age calculator will display an error message if an invalid date is entered. Please ensure the dates are in the correct format (YYYY-MM-DD).
How accurate is the age calculator?
The age calculator uses UTC date construction to avoid local time zone drift in the calculation, ensuring an accurate result.