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Half Birthday Calculator

Find out when your half birthday is — the day you turn “and a half” — how many days are left until the next one, and the dates of your upcoming half birthdays.

100% Private Countdown Calendar or exact

Your Birthday

Your half birthday
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Next half birthday
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Days to go
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You will turn
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Upcoming half birthdays

AgeDateDay of the week

How to work out a half birthday

A half birthday is the day exactly half a year after your birthday — the day you turn 5½, 18½ or 40½. There are two common ways to find it:

  • Calendar method: add six months to your birthday and keep the same day of the month. A 10 March birthday has its half birthday on 10 September. If that month is shorter, the last day of the month is used, so 31 August becomes 28 February (29 February in leap years).
  • Exact method: take the day halfway between one birthday and the next — 182 days later in most years, 183 when the year includes 29 February.

Half birthday ideas

Half birthdays are popular for babies (the 6-month milestone), for children whose birthdays fall in the school holidays so they can celebrate with classmates, and for anyone born close to Christmas or New Year who would like a party at a quieter time of year.

Frequently Asked Questions

Six months after your birthday, on the same day of the month. Enter your date of birth above to see the exact date, the countdown and which day of the week it falls on.

When the month six months later does not have that day, the calendar method uses its last day. For example, 31 August gives 28 February, or 29 February in a leap year. Choose the exact method if you prefer the true midpoint instead.

A year is 365 or 366 days, so the true halfway point is 182.5 or 183 days. The exact method uses 182 days in a normal year and 183 days in a year that contains 29 February.

It is the 6-month mark. Many parents celebrate it with a small cake or photo shoot. For a baby born on 15 January, the half birthday is 15 July.

The table above lists your next half birthdays together with the day of the week each one falls on.
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