Free Age Calculator — Exact Age in Years, Months, Days
Enter a birth date to get an exact age, total days lived, and a countdown to the next birthday. Also works as a date-difference calculator.
Frequently Asked Questions
How is exact age calculated?
The calculator counts full calendar years first, then full months, then remaining days — the same way ages are reckoned legally. Someone born January 31 turns a month older on the last day of February, not March 2.
Can I calculate the time between any two dates?
Yes — set "Date of birth" to your start date and "As of" to the end date. It works for project durations, anniversaries, or anything else measured in calendar time.
How are leap years handled?
All counts use real calendar dates, so leap days are included automatically. Born February 29? Your birthday countdown targets February 29 in leap years and March 1 otherwise.
Is my birth date stored?
No. The calculation runs in your browser and nothing is transmitted or saved.