Age calculator
Find your exact age in years, months and days — plus total days lived and countdown to your next birthday.
On this page
How exact age is calculated
The calculator counts completed years since your birth date, then completed months since your last birthday, then the remaining days — correctly handling leap years and months of different lengths. This is the same method used on official forms and legal documents. The donut above shows how far you are through your current year of life, from your last birthday to your next one.
Frequently asked questions
How many days old am I?
The exact figure appears above — it counts real calendar days including every leap year you've lived through.
Can I calculate age at a past or future date?
Yes — set the "Age as of" field to any date, e.g. for filling in forms or planning milestones.
Why do leap years matter for age calculation?
Leap years add an extra day (Feb 29) roughly every four years — ignoring them can throw off a total-days-lived count by several days over a lifetime.