Pregnancy Weight Gain Calculator (IOM Guidelines)
Tracks gestational maternal weight trajectories week-by-week against Institute of Medicine (IOM) clinical reference guidelines by pre-pregnancy BMI.
Pre-pregnancy BMI: 22.0
How This Calculation Formula is Formulated
Calculates recommended gestational maternal weight gain curves week-by-week based on pre-pregnancy BMI category and Institute of Medicine (IOM) clinical reference guidelines.
Variable Definitions & Measurement Units
Week 20 Weight Check for Normal Pre-Pregnancy BMI
A woman with 22.0 pre-pregnancy BMI checks her recommended weight gain at Week 20 of pregnancy.
Risks of Inadequate and Excessive Gestational Gain
Inadequate maternal weight gain increases the risk of preterm birth, low birth weight (under 2.5 kg), and developmental delays.
Excessive weight gain increases the risk of gestational diabetes mellitus, preeclampsia, macrosomia (birth weight > 4.5 kg), cesarean section deliveries, and long-term postpartum weight retention.
Frequently Asked Questions About Pregnancy Weight Gain Calculator (IOM Guidelines)
Do twin pregnancies require more weight gain?
Yes. For normal BMI, the IOM recommends 17 to 25 kg total weight gain for twin gestations.
Should an overweight pregnant woman diet to lose weight?
No. Weight loss during pregnancy is clinically discouraged because it can release ketones harmful to fetal neurological development.
Related Online Calculators
Frequently referenced alongside Pregnancy Weight Gain Calculator (IOM Guidelines).
Pregnancy Due Date Calculator
Estimates expected date of delivery (EDD), current gestational week, and key milestone trimesters via Naegele's clinical rule.
Ovulation & Fertility Window Calculator
Projects prospective ovulation day, peak 6-day fertile conception window, and upcoming menstrual cycle dates.
Calorie Calculator
Computes Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) via Mifflin-St Jeor.