Age Calculator
Calculate exact age in years, months, and days, plus total days lived and a countdown to your next birthday.
Runs entirely in your browser — your files are never uploaded to a server.
How It Works
1. Choose Your File
Drag & drop or select the file you want to work with.
2. Processed in Your Browser
Everything happens locally on your device — your file is never uploaded anywhere.
3. Download Your Result
Get your finished file instantly, ready to save or share.
Frequently Asked Questions
Can I calculate age as of a specific date, not just today?
Yes, set the "Calculate Age As Of" field to any date — useful for legal, historical, or planning purposes.
What totals are shown?
Total months, total weeks, and total days lived, alongside the years/months/days breakdown.
How is the next birthday countdown calculated?
It finds the next occurrence of your birth month and day from the "as of" date, whether that's later this year or next year.
What happens with a February 29th birthday?
In non-leap years, the calculation treats the birthday as observed on the nearest equivalent date — a well-known edge case with no single universal convention.