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Age Calculator

Calculate your exact age or the time between any two dates in years, months, days, hours, and more.

Quick Examples

Enter your birth date or the starting date
Enter the date to calculate age as of (defaults to today)

Check to include time of birth for more precise calculation

Enter time of birth in 24-hour format (HH:MM)

Check to include developmental milestones (for children under 18)

Check to include fun facts about your age

About This Calculator

This age calculator lets you determine your exact age or the time between any two dates with precision. Whether you want to know your precise age for legal or administrative purposes, are curious about how many days you've been alive, or need to calculate an age at a specific future date, this calculator provides detailed results with multiple time units and interesting statistics. For parents, the calculator can also show developmental milestones for children, helping you track your child's progress against typical developmental stages. The calculator accounts for leap years and different month lengths to ensure accuracy, and even includes fun facts like your age on other planets or how many heartbeats you've had in your lifetime.

Frequently Asked Questions

How does the age calculator account for leap years?

This calculator uses precise date arithmetic that accounts for leap years, different month lengths, and even leap seconds if time is included. It counts the actual number of days between the birth date and calculation date, providing the most accurate possible age calculation.

Are developmental milestones standardized?

The developmental milestones shown are based on typical averages from pediatric guidelines. It's important to remember that children develop at different rates, and there's a wide range of "normal" development. If you have concerns about your child's development, consult with a healthcare provider.

How is age calculated in different time units?

The calculator first determines the exact number of days between the two dates. Then it converts this to other units: years are calculated accounting for leap years; months account for varying month lengths; weeks are calculated as days divided by 7; hours, minutes, and seconds are straight multiplications of the days value.

Why does my age on other planets matter?

Your age on other planets doesn't have practical importance, but it's a fun way to think about how time is relative. Since planets orbit the Sun at different speeds, a "year" on each planet varies. For example, a Mercurian year is only 88 Earth days, while a Neptunian year is about 165 Earth years!

How accurate is the "next birthday" countdown?

The next birthday countdown is calculated precisely to the day. If you've included time of birth, it will count down to the exact hour and minute of your birth. The calculation accounts for leap years and the exact number of days in each month between now and your next birthday.

Can I use this calculator for legal purposes?

While this calculator provides precise age calculations, for official or legal purposes, you should always verify with the relevant authorities about their specific methods of age calculation. Some jurisdictions use different rules for calculating legal age.