Six months later
The calculator uses calendar-month math, so leap years and month lengths are handled by the browser.
Date calculators
Half Birthday Calculator
Find your half birthday date, weekday, and days from today for any birthday and year.
Complete guide
How to use Half Birthday Calculator
The Half Birthday Calculator adds six calendar months to a birthday for the selected year. It is useful for party planning, school milestones, baby photos, and fun date checks.
Year selector
Check this year, next year, or any custom year.
Days away
See how many days the half birthday is from today.
Answers
Half Birthday Calculator FAQs
What is a half birthday?
A half birthday is the date six months after a birthday.
Does February 29 work?
Yes. Browser date handling maps leap-day edge cases into the selected calendar year.
Can I use it for someone else?
Yes. Enter any birthday and the year you want to check.
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