Age Calculator

Calculate your exact age in years, months, and days.

Enter your details

Date of Birth

As of Date

Your result

Enter your values and the result appears here

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How it works

About this calculator

Need to know exactly how old you are — down to the day? Our age calculator gives you the full breakdown: years, months, days, weeks, total days since birth, and even how long until your next birthday. It handles leap years and all the messy calendar math so you do not have to. Whether it is for a form, a milestone, or pure curiosity, the answer is instant.

The formula, explained simply

We compare your date of birth to any date you choose (today is the default). The calculator properly accounts for leap years, months with different numbers of days, and all the edge cases that make manual age calculation surprisingly tricky. The result shows your age in multiple formats — useful for different situations.

When you would use this

Doctors appointments often ask for age in years and months. Legal forms need exact ages. Parents track their children developmental milestones. People planning retirement calculate time until they can stop working. And sometimes you just want to know exactly how many days you have been alive — it is a fun number to have.

Frequently asked questions

How exactly is age calculated?

We subtract the birth date from the "as of" date, accounting for leap years and varying month lengths. The math is precise.

Does this handle leap years?

Yes, February 29 is handled correctly. The calculator knows which years are leap years and accounts for them.

Can I calculate someone else age?

Of course. Just enter their birth date and any "as of" date you want. You are not limited to today.

Why would I need age in months?

It is most common for tracking infant and toddler development. Doctors use months for children under two.

How accurate is this?

100% accurate. The calculator uses proper date arithmetic and accounts for every calendar edge case.