Find your exact age in years, months, days, weeks — and when your next birthday is.
What is an Age Calculator?
An age calculator determines the exact age of a person based on their date of birth and the current date. Our free online age calculator instantly shows your age in years, months, days, total weeks, total days, and even how many days until your next birthday.
How to Use This Age Calculator
Simply select your date of birth using the date picker above and click "Calculate Age." The tool instantly computes your exact age across multiple time units. No manual math needed.
Why Use an Online Age Calculator?
- Verify age for legal documents, school admission, or job applications
- Calculate retirement age and years remaining
- Find out age in exact days for medical purposes
- Determine eligibility for age-based government schemes
- Plan birthday parties with exact countdown
Age Calculation Formula
Age is calculated by subtracting the birth date from today's date. The tool accounts for leap years, varying month lengths, and ensures the result is accurate to the day. The formula adjusts for cases where the birth day in the current month hasn't occurred yet.
Frequently Asked Questions
How accurate is this age calculator?
It is 100% accurate to the day. The tool uses JavaScript's built-in date functions to account for leap years, different month lengths, and timezone offsets.
Can I calculate age from a date in the future?
No, the age calculator only works for past dates. If you enter a future date, you'll see an error message.
What is the maximum age I can calculate?
There is no maximum limit. You can calculate the age of historical figures from centuries ago.
Does the tool store my date of birth?
No. All calculations run entirely in your browser. Your data never leaves your device.
How is 'days to birthday' calculated?
It finds your next birthday in the current or next year and subtracts today's date.