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How old am I exactly? This calculator takes a birth date and a reference date and shows the age two ways: a calendar-accurate breakdown into full years, months and remaining days, and the exact total number of days since birth. The reference date defaults to today - enter a different date instead and you get the age on exactly that day, for example for an application deadline or an age check.
The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded and nothing is stored. Both dates are anchored to midnight in coordinated universal time so that daylight saving does not distort the result. The breakdown counts the full years first, then the full months and finally the remaining days - calendar-accurate, that is taking different month lengths and leap years into account. Change an input and everything updates instantly.
An honest note: this counts calendar age, with no special timezone or birth-certificate rules. If the reference date is before the birth date, the calculator shows zeros rather than a negative age. For a plain span between any two dates without a birth-date framing, use the date-difference calculator.
Specifications
Specifications
Input formats
Form inputs (no file)
Processing
Locally in your browser (JavaScript)
File upload
None
In 3 steps
Enter the birth date.
Pick a reference date (default: today).
Read off the age in years, months, days and the total days.
Limitations: Counts calendar age (calendar-accurate, no special timezone or birth-certificate rules). If the reference date is before the birth date, the calculator shows zeros instead of a negative value. For a plain span without a birth-date framing, use the date-difference calculator.
FAQ
Are my inputs uploaded?
No. The calculation runs entirely locally in the browser (pure JavaScript); nothing is sent or stored.
How do I calculate my age on a specific day?
Enter your birth date and change the reference date to the day you want - the calculator immediately shows the age on exactly that day.
What does the total number of days show?
The exact number of days from birth up to the reference date - independent of the years/months/days breakdown, and always exact.
Why do months sometimes not match 30 days?
Because months differ in length. The breakdown is calendar-accurate; the exact total number of days is shown separately above.