Obstetrics
Pregnancy Calculators
A set of tools to help you understand dating, weight gain and growth through pregnancy. These are estimates only, intended to support — not replace — discussion with Dr McCaffrey or your care team.
Dating
Gestational Age Calculator
Work out how many weeks pregnant you are and your estimated due date, from either your last menstrual period or a known due date.
Weight gainBMI & Weight Gain Calculator
Calculate your pre‑pregnancy BMI and see the recommended total and weekly weight gain range for your body mass index, for singleton or twin pregnancies.
GrowthBirth Weight Centile Calculator
See where a baby's birth weight sits on the growth curve for their exact gestational age and sex.
GrowthFetal Growth Assessment
Enter ultrasound measurements (head, abdomen and femur) to estimate fetal weight and see its centile for gestational age.