Baby Gender Predictor

This formula was given to my wife by an old lady who said it was once popular among Transylvanian and Galician gypsies back in the Austro-Hungarian days. Since the math behind it is a bit tricky, I built this little tool to help others try it out.

After testing lots of parent and child birthdates, I found that — strangely — it worked more often than I expected. We even planned and got our baby girl using this method!

Is it really accurate? Honestly, I’m not sure. But it worked for us! Why does it seem to get it right about 75% of the time? Coincidence? Luck? Or maybe something more?

Give it a try — and have fun!

Mother's Birthday:
Father's Birthday:
Baby's Conception Month:

Welcome to the Baby Gender Predictor!

You can use the form on the left to:

  • Plan your future pregnancy.
  • Check how accurate this formula is by using conception months of your existing children.

Note: Sometimes this formula may not be able to confidently determine the gender.

If you prefer, check out the Calendar version of this baby gender predictor. It shows a 5-year chart to help you see which months may offer better chances for a boy or a girl.