Calculate your probability of having twins based on age, family history, fertility treatments, and other factors.
Get accurate twin pregnancy odds using scientifically validated formulas that consider maternal age, family history, fertility treatments, and other factors that influence twin conception rates.
Click on any example to load it into the calculator.
Young woman with no family history of twins and no fertility treatments.
Maternal Age: 25 years
Family History: 0 twins
Previous Pregnancies: 1 pregnancies
Fertility Treatment: 0 type
Height: 160 cm
BMI: 22 BMI
Ethnicity Factor: 1 factor
Woman with family history of fraternal twins increasing her chances.
Maternal Age: 30 years
Family History: 2 twins
Previous Pregnancies: 2 pregnancies
Fertility Treatment: 0 type
Height: 165 cm
BMI: 24 BMI
Ethnicity Factor: 1 factor
Woman using Clomid fertility treatment significantly increasing twin chances.
Maternal Age: 35 years
Family History: 0 twins
Previous Pregnancies: 0 pregnancies
Fertility Treatment: 1 type
Height: 170 cm
BMI: 26 BMI
Ethnicity Factor: 1 factor
Older woman with increased natural twin rates due to age-related FSH changes.
Maternal Age: 38 years
Family History: 1 twins
Previous Pregnancies: 3 pregnancies
Fertility Treatment: 0 type
Height: 168 cm
BMI: 28 BMI
Ethnicity Factor: 1 factor