Question 1

What is a half birthday?

Accepted Answer

A half birthday is the date exactly six months after your date of birth. For example, if you were born on July 1, your half birthday is January 1.

Question 2

Why do people celebrate half birthdays?

Accepted Answer

Half birthdays are popular for summer-born kids who have school friends in winter, for kids who share a birthday with a sibling, and as a fun mid-year excuse for cake. Schools and preschools often throw half-birthday parties too.

Question 3

What if my birthday is the 31st?

Accepted Answer

The calculator rolls to the last day of the month when the target month has fewer days. So a January 31 birthday becomes a half-birthday on July 31; a March 31 birthday rolls to September 30.

Question 4

Is my birthday data sent anywhere?

Accepted Answer

No. The calculation runs entirely in your browser. The birthday you enter never leaves your device.