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Free calculator tool
Age Calculator
Calculate age on any date in calendar years, months and days, with total days, complete weeks and the next birthday.
Browser-side processing No sign-up Free to use
Choose a date of birth to calculate an exact calendar age.
How it works
A direct path from input to result.
Adjust the options
Use clear controls to choose exactly how the result should be produced.
Copy or download
Take the finished result with you. No account or saved project required.
About this tool
Use Age calculator with confidence.
Age is normally expressed as completed calendar years, followed by completed months and remaining days. This calculator uses date-only calendar arithmetic, avoiding the time-zone shifts that can occur when a birthday is treated as a timestamp.
You can calculate age on today or on another comparison date. The result also includes complete months, complete weeks, total elapsed days and the next birthday relative to that selected date.
Common uses
Check how old someone was at an event or will be on an application, trip or deadline date.
Translate a calendar age into elapsed-day and complete-week totals.
See the next birthday date and the number of days remaining from the chosen comparison date.
Practical tips
Forms and eligibility rules may ask for age on a deadline rather than age today.
The calculator clamps February 29 anniversaries to the final valid day of February in non-leap years; legal rules can vary by jurisdiction.
Official age, school, benefit and legal eligibility may use specific local definitions that override a general calculator.
Questions about Age calculator
Why are months not all treated as 30 days?
Calendar months have different lengths. The exact result advances through completed calendar years and months before counting the remaining days.
How is a February 29 birthday handled?
For the displayed calendar span, the anniversary is clamped to February's final valid day in a non-leap year. Check local rules for official legal use.
Does the calculation use my time zone?
It works with the date values themselves rather than times of day, which prevents a birthday from shifting to an adjacent date because of a time-zone conversion.