Find out your half birthday! Enter your date of birth and we'll calculate the exact date that falls halfway through your birthday year.
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A half birthday falls exactly 6 months after your actual birthday. Use this half birthday calculator to find yours instantly. Half birthdays are especially popular for children born near major holidays - celebrating their half birthday ensures they get their own special day!
A half birthday is calculated by adding exactly 6 months to your date of birth. For example, if you were born on March 15, your half birthday is September 15. If the resulting month doesn't have enough days (e.g., August 31 → February), it rolls to the last day of that month.
Half birthdays are popular for kids born near Christmas/holidays so they can have a party with friends when school is in session. Adults celebrate them too - it's a fun excuse for a mid-year celebration!