Age Calculator
Find your exact age in years, months, and days from your date of birth.
Age Calculator
Your Result
How Age Is Calculated
This tool calculates the exact difference between your date of birth and a reference date (today, by default) in complete years, months, and days — the same way age is calculated on official documents. It also shows totals in days, weeks, and months, plus a live countdown to your next birthday.
All calculations account for varying month lengths and leap years, so the result is precise down to the day.
Frequently Asked Questions
Why do I need to pick an 'as of' date?
By default the calculator uses today's date, but you can calculate someone's age at a specific date in the past or future, for example for legal, medical, or eligibility purposes.
Does it account for leap years?
Yes, the calculation is based on real calendar dates, so leap years are automatically handled correctly.
Can I calculate the age of an event, not a person?
Yes, enter any start date and end date, this works for anniversaries, time since a project started, or any date-based duration.