Age Calculator – Find Your Exact Age
Please select a valid date of birth (must be before the "as of" date).
What Is an Age Calculator?
An age calculator finds the exact time elapsed between a birth date and a reference date, expressed in years, months, and days — as well as total months, weeks, and days for reference.
How to Use This Calculator
Enter your date of birth, and optionally change the "Calculate Age As Of" field if you want your age on a specific future or past date (it defaults to today). Click "Calculate Age" to see your exact age broken down.
Why Isn't Age Just a Simple Subtraction?
Because calendar months have different lengths and years include leap days, calculating exact age requires accounting for whether the birth month/day has occurred yet in the current year — this calculator handles that automatically.
Frequently Asked Questions
Can I calculate my age on a future date?
Yes, change the "Calculate Age As Of" field to any future date to see how old you'll be on that day.
Does this account for leap years?
Yes, the calculation correctly accounts for leap years when determining days and total elapsed time.
Why do total days and (years × 365) not match exactly?
Because leap years add extra days roughly every 4 years, so total days will be slightly higher than a simple 365-day-per-year estimate.
Can I use this to calculate age for legal or official purposes?
This calculator provides an accurate age calculation, but always verify with official documentation for legal, medical, or government purposes.