Twin probability
What are the chances of two?
Twin rates depend on age, family history, BMI, and whether you're using fertility assistance. Here's your number.
Maternal age at conception
32
Twins in your maternal line?
Mom, sister, or maternal grandmother
Have you had twins before?
Body mass
Number of prior pregnancies
Using IVF or fertility treatment?
Estimated chance of twins
3.9%vs. 3.4% baseline
In line with the typical population rate.
Compared to baseline
For your baby3.9%
Average baby3.4%
How accurate is this, honestly?aboutPopulation stats
AccuracyPopulation stats
Twin probability rises with maternal age until about 40 because older ovaries sometimes release more than one egg per cycle. Family history matters because that tendency is genetically inherited through the mother's side (a father whose mother had twins doesn't pass it to you). For IVF, modern clinics typically transfer one embryo at a time — so the eye-popping twin rates you may have heard about are largely from older protocols.
Read the full methodology →