Twin probability calculator

A live, evidence-based estimate of your odds of conceiving twins, drawn from peer-reviewed research on ten reproductive and genetic factors.

Question 1 / 10Current estimate1.5%

What's your age?

Twin rates rise sharply after 30 and peak around 35–39 due to higher FSH levels.

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Source

How we calculated this

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References

  1. NIH twin birth statistics 2023
  2. ASRM IVF twin rate guidelines 2024
  3. ACOG family history twin probability
  4. WHO ethnicity twin rate variations