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Find a percentage of a number or a percentage change.
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Age Calculator
Calculate completed years, months, and days between two dates.
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How to use age calculator
- Select Date of birth as the starting calendar date.
- Set Age on this date to the intended comparison date.
- Choose Calculate and review completed years, months, days, and total days.
Work through an example
Compare two dates in completed years, months, and days using the calculator's clamped month-end convention.
Calculate calendar age and understand month-end anniversaries →Formats, privacy, and practical limits
Illustrative calculations based on the values you enter. Figures exclude fees, taxes, and rate changes unless you include them. Returns are assumptions, not guarantees.
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Frequently asked questions
How are month-end anniversaries handled?
An anniversary beyond the end of a shorter month is clamped to that month's final day, and remaining days are counted from that anchor.
Does it calculate legal eligibility or exact birth-time age?
No. It uses selected calendar dates without a time-of-day field and does not determine legal or organizational eligibility rules.
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