Age Calculator
Calculate your exact age in years, months, weeks, days, hours, and minutes from your date of birth. Free, instant, and accurate age calculation.
Enter your date of birth to calculate your age
How to Use Age Calculator
Enter Date of Birth
Select your birth date using the date picker. You can type the date or use the calendar interface.
Choose Calculation Date
By default, age is calculated as of today. Change this date to calculate your age on any past or future date.
View Results
See your exact age in years, months, and days, plus detailed breakdowns in weeks, hours, minutes, and seconds. Also see when your next birthday is!
Why Use Our Age Calculator?
Precise Calculations
Calculate exact age down to the second using accurate date arithmetic that accounts for leap years and varying month lengths.
Multiple Units
See your age in years, months, weeks, days, hours, minutes, and seconds - all calculated simultaneously for comprehensive results.
Next Birthday Countdown
Automatically calculates when your next birthday will be and how many days until you celebrate!
Flexible Date Selection
Calculate age as of today or any past/future date. Perfect for planning events or checking ages at specific times.
Private & Secure
All calculations happen in your browser. Your birth date is never sent to any server or stored anywhere.
100% Free
No ads, no hidden costs, no signup required. Unlimited age calculations forever.
Frequently Asked Questions
How is age calculated accurately?
The calculator uses precise date arithmetic that accounts for leap years, varying month lengths (28-31 days), and different year lengths. It calculates the exact difference between two dates down to the second.
Why does the "Calculate Age On" field default to today?
Most people want to know their current age, so we default to today's date. However, you can change it to calculate your age on any past date (like a specific anniversary) or future date (for planning purposes).
How are months calculated when ages don't align perfectly?
If your birth date is the 31st but the current month only has 30 days, the calculator adjusts appropriately. For example, if you were born on January 31st and today is March 30th, you're 1 month and 28-30 days old (depending on whether it's a leap year).
Can I use this for legal age verification?
While our calculations are mathematically precise, always verify age requirements with official documentation (birth certificates, IDs, etc.) for legal purposes. Time zones and exact birth times may matter in legal contexts.
Why do I have more total months than (years × 12)?
Total months includes partial months. For example, if you're 25 years and 6 months old, your total months would be 306 (25 × 12 + 6), not just 300.
How do you handle leap years?
The calculator automatically accounts for leap years (February 29th). If you were born on a leap day, your birthday in non-leap years is typically celebrated on February 28th or March 1st, and the calculator shows the next occurrence.
Can I calculate someone else's age?
Absolutely! Just enter their birth date instead of yours. This is useful for checking children's ages, planning birthday parties, or calculating age differences between people.
What's the maximum date range I can calculate?
You can calculate ages spanning over 100 years in either direction. The calculator works accurately for dates from 1900 to 2100.