Age Calculator
Enter a date of birth to get your exact age in years, months and days — or use any two dates to find the time between them.
Defaults to today — change it to calculate the age at any other date, or the days between two dates.
= 0 total days
Next birthday
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Ages are calculated from calendar dates only. For anything used in an official or legal context (forms, eligibility, contracts), confirm the exact requirement with the relevant institution.
How it works
Pick a date of birth
Use the date picker to avoid any day/month mix-up.
Set a reference date (optional)
Leave it as today, or pick another date to calculate age at that point — or the gap between any two dates.
Read the exact age
See years, months and days, the total day count, and the next birthday countdown.
What people use an age calculator for
Knowing an exact age is useful for more than curiosity.
Age requirements
Official forms
Planning a birthday
Time between events
Project timelines
A few things worth knowing about this calculator
An age calculator does more than satisfy curiosity — it's a fast way to get a precise figure for situations where "about 30 years old" isn't good enough, like checking whether someone meets an age requirement for a form, a discount, or an eligibility rule that's written in exact years. Because it works from calendar dates rather than a rough estimate, it also correctly accounts for leap years, so a birth date on or around February 29th doesn't throw off the count the way manual math sometimes does.
The years/months/days breakdown is meant to be read together: months and days are always the remainder after counting full years, so "31 years, 4 months, 12 days" means exactly that — not 31.4 years. The total day count next to it is a separate, simpler figure that's handy for situations that measure things purely in days rather than calendar units.
One habit worth building when using any date calculator: double-check the date you entered before trusting the result. Because date formats differ by region — day/month/year in most of the world versus month/day/year in the US — typing a date manually is the most common way to end up with an age that's quietly wrong by months or even years. Using the calendar picker instead of typing digits avoids that mix-up entirely.
Frequently asked questions
How does this age calculator work?
Enter your date of birth, and optionally a reference date (it defaults to today). The calculator counts the exact number of full years, months and days between the two dates, along with the total number of days.
Can I use this to find the number of days between two dates?
Yes. Set the first date as the earlier date and the reference date as the later one — the calculator works the same way for any two dates, not only a birth date.
How is age in years, months and days calculated?
The calculator counts full calendar years, then full calendar months from the last birthday, then the remaining days — the same way you'd count on a calendar by hand, so it correctly handles different month lengths and leap years.
Why should I double-check the date format?
Date formats vary by region — day/month/year versus month/day/year is the most common source of an age that looks off by months or even years. This tool uses your browser's native date picker specifically to avoid that kind of mix-up.
What is the "next birthday" section for?
It shows the date of the next birthday after today and how many days remain until it, calculated from your date of birth regardless of what reference date you've set for the main calculation.
Is this age calculator free to use?
Yes, completely free, with no account or sign-up, and it runs entirely in your browser.