Age Calculator
Your exact age in years, months and days from any birthdate
About this tool
This free age calculator tells you exactly how old you are in years, months, and days — not just the year difference. It correctly accounts for leap years and varying month lengths, so even edge-case birthdays like February 29 are calculated accurately.
Beyond your main age, the tool shows your total days alive, total weeks lived, and a live countdown to your next birthday. You can also pick any target date to calculate your age at a specific future moment — useful for legal checks ("will I be 21 by this event?"), immigration documents that require age in months, or curious questions like "how old was my grandparent when I was born?"
Age calculations come up in many real-life situations: checking Medicare or Social Security eligibility, verifying a child has reached the school enrollment cutoff, completing forms that ask for age in full months, or calculating the age difference between two people. Pediatricians often record infant age in weeks for the first few months, which this tool supports by showing total weeks.
All calculations run entirely in your browser. Nothing is sent to a server, and the tool works offline once loaded.