Calculate exact age from date of birth to today or a custom date.
Use this free age calculator to work out your exact age from your date of birth. Enter your birthday and the tool will calculate your age in years, months and days, together with useful extra details such as total months, total weeks, total days, your next birthday and the number of days until it arrives.
This is useful when you need a quick answer without counting manually or dealing with awkward calendar differences. Months have different lengths, leap years can affect the result, and calculating age on a specific date can be surprisingly easy to get wrong.
Calculate Age from Date of Birth
The age calculator compares your date of birth with today’s date, or with a custom date if you enter one. This makes it useful for checking your current age, calculating someone’s age on a past date, or working out how old someone will be on a future date.
You can use it for personal records, school forms, travel documents, insurance checks, health paperwork, event planning, birthday planning, or simple curiosity.
What This Age Calculator Shows
The calculator gives you more than just a rough age estimate. It can show:
Exact age in years, months and days
Total months lived
Total weeks lived
Total days lived
Next birthday date
Days until the next birthday
That makes it more useful than a basic year-difference calculator, especially when you need a precise result.
Calculate Age on a Specific Date
Sometimes you do not just need to know someone’s age today. You may need to know their age on a specific date, such as the start of a school year, a registration deadline, a medical appointment, a legal date, a sports age cut-off, or a future birthday.
Use the optional “age on date” field to calculate age against any chosen date instead of today.
Why Use an Online Age Calculator?
Manual age calculations are easy when you only need an approximate answer, but they become less reliable when exact dates matter. A proper age calculator handles calendar-based differences automatically and gives you a cleaner result in seconds.
It is fast, simple and works directly in your browser.
FAQ
How does the age calculator work?
The calculator compares the date of birth with today’s date, or with the custom date you enter, and calculates the exact calendar difference.
Can I calculate age on a past or future date?
Yes. Use the optional age-on-date field to calculate how old someone was on a past date or how old they will be on a future date.
Does the calculator include leap years?
Yes. The calculator is designed to account for real calendar differences, including leap years and months with different numbers of days.
Can I calculate age in days?
Yes. The calculator shows the total number of days as well as the exact age in years, months and days.
Is this age calculator free?
Yes. The age calculator is free to use and works directly online without needing an account.