Question: if my birthday is may 1 when is my half birthday?
Answer: There are two common ways to calculate a half birthday. The easy method is to just add 6 months to your current birthday and keep the day of the month the same. e.g. If you were born on (Month 5) May 10, then your half birthday would be on (Month 5 + 6 Months = Month 11) November 10.