🎂
Half Birthday Calculator
Find the exact date of your half birthday, six months from your actual birthday, and see how many days until it arrives.
What a half birthday is
Your half birthday falls exactly six calendar months after your actual birthday, a fun milestone some people celebrate for kids born near major holidays.
How it’s calculated
This calculator adds six months to your birth month and keeps the same day, adjusting automatically for shorter months (for example, a birthday on August 31st gives a half birthday on the last day of February). It then finds the next upcoming occurrence and counts the days until it arrives.
This is a lighthearted date calculation for celebrations and planning, not an official or legal date designation.
Last reviewed August 2026