Age Calculator
Calculate exact age or days between two dates
What is an Age Calculator?
An age calculator finds your exact age in years, months, and days from a birth date to today or any end date you choose. It is useful for forms, eligibility checks, planning milestones, or simply answering “how old am I?” Parents, teachers, HR staff, and genealogists often need a precise age breakdown rather than a rough year count alone.
Results are computed in your browser; dates you enter stay on your device. No account is required, and the page works on phones and desktops alike.
How to Use This Age Calculator
- Pick your Start / Birth Date using the date field.
- Optionally set an End Date (defaults to today if left as today).
- Click Calculate to see age in years, months, days, and total days elapsed.
- Change either date and calculate again to compare different periods.
Notes
The calculator uses calendar dates in your local timezone as provided by your browser. Leap years are accounted for when counting years and months. Partial months are calculated by advancing from the start date month-by-month until the next increment would exceed the end date.
For legal age, school enrollment, insurance, or contract deadlines, always confirm requirements with official sources — this tool provides general information only and does not replace legal determination of age.
Frequently Asked Questions
How is age calculated between two dates?
The tool counts full years and months from the start date to the end date, then remaining days. Total days is the inclusive or elapsed day count shown in the result area, useful for anniversaries and deadlines.
Does it handle leap years?
Yes. February 29 and other calendar rules are handled by the browser’s date logic so long spans including leap years are calculated correctly.
Can I calculate someone else’s age?
Yes. Enter any valid birth date as the start date and optionally pick an end date other than today — for example, a historical figure’s age on a specific day.
What is the difference between this and a date difference calculator?
This tool emphasizes age in years, months, and days from a birth date. Our Date Difference Calculator focuses on the span between any two dates without framing the result as “age.”
Why might my age differ from another website?
Small differences can come from timezone boundaries, whether “today” is evaluated at midnight local time, or how months are counted near month-end. For official use, confirm the rule your organization applies.
Related Tools
See also Date Difference Calculator, Countdown Days, and Unix Timestamp Converter.