Age Calculator
Find your exact chronological age in years, months, and days.
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Quick Tip
Pick your date of birth from the date field.
About This Tool
Why use Age Calculator?
Enter a date of birth and this calculator returns the exact age in years, months and days as of today. It counts calendar months rather than averaging them, so the day-of-month is preserved: someone born on 15 March 1990 turns a whole number of years every 15 March, and the months and days count forward from there.
Leap years are handled by the calendar itself, so ages spanning 29 February come out right. Official forms almost always ask for age in completed years, which is the first figure shown — the months and days are for the cases where precision matters, such as school admission cut-offs or medical records for young children.
Key Benefits
Exact years, months and days
Not an approximation from dividing by 365.25 — the calendar months are counted properly.
Leap years handled
Ages that span 29 February are counted correctly, including birthdays on that date.
Nothing leaves your browser
The date you enter is used on your device only; no birth date is uploaded or stored.
How to use Age Calculator
- 1
Pick your date of birth from the date field.
- 2
Read the age in completed years, months and days.
- 3
Use the completed-years figure for forms and applications.
- 4
Change the date to check someone else's age without reloading the page.
Best use cases
Fill in an age field on an application or visa form.
Check eligibility against an age cut-off for school or a scheme.
Work out a child's age in months for a health record.
Find out exactly how old someone is on a given date.
Age Calculator FAQs
How is age calculated exactly?
Subtract the birth year from the current year, then adjust: if the birthday has not happened yet this year, take one year off and count the months and days that have passed since the last birthday.
How do leap year birthdays work?
Someone born on 29 February gains a year on 28 February or 1 March in common years, depending on local convention. The completed-years figure is the same either way except on that one day.
Why does my age in months look different elsewhere?
Some tools convert days to months by dividing by 30 or 30.44. This calculator counts real calendar months, which is what official forms expect.
Can I calculate age at a past or future date?
This tool measures against today. For a different reference date, use the age difference calculator and enter both dates.
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