What Day Will I Turn 18?
Find out the exact date and day of the week of your 18th birthday. This milestone marks adulthood in most countries — enter your birth date to see when you'll turn 18!
About the 18th Birthday Calculator
Your 18th birthday is a major milestone. In most countries, turning 18 means you're legally an adult with new rights and responsibilities — you can vote, sign contracts, serve on a jury, and more.
Use this calculator to find out exactly what day of the week your 18th birthday falls on. Planning ahead? Knowing it's a Saturday vs. a Tuesday can help with party planning!
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Frequently Asked Questions
How is my 18th birthday calculated?
We simply add 18 years to your birth date. If you were born on February 29 (leap day), your 18th birthday would be February 28 or March 1 depending on whether it's a leap year.
Why is turning 18 significant?
In most countries, 18 is the age of majority — when you legally become an adult. You can vote, sign contracts, and are considered fully responsible for your actions.
What if I'm already over 18?
The calculator will still show you the date and day of the week when you turned 18, which can be fun to look back on!
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