The pregnancy weight gain calculator uses pre-pregnancy height and weight for BMI category and an IOM-style total gain band for singleton pregnancies—discuss with your OB.
How to use
- Enter pre-pregnancy height (cm) and weight (kg).
- Read BMI, category, and total gain range.
- Pair dates with the due date calculator if helpful.
Example
165 cm, 60 kg pre-pregnancy → BMI ~22 (normal), total gain band ~11.5–16 kg.
Twins and complications are outside this model.
Frequently asked questions
What guideline is used?
Pre-pregnancy BMI category from height and pre-pregnancy weight maps to an approximate singleton total gain band (IOM-style)—for discussion with prenatal care, not a personal prescription.
What should I enter?
Enter pre-pregnancy height (cm) and pre-pregnancy weight (kg). If already pregnant, use your last reliable pre-pregnancy weight or ask your clinician how to estimate pre-pregnancy BMI.
Twins or complications?
No—twins and conditions like gestational diabetes need clinician-specific plans. This page covers typical singleton bands only.
Relation to due date tools?
The due date calculator focuses on dates and gestational age; this page focuses on how much total weight to gain—both are planning aids, not prenatal care.
Gain evenly each week?
No—early pregnancy gain is often lighter; later weeks may accelerate. This page shows a total band, not weekly schedules. Follow your OB weight curve.
How to read BMI categories?
Underweight / normal / overweight / obese map to pre-pregnancy BMI cutoffs—individual variation still applies. See the BMI calculator for context.
Can I save height and weight?
Yes. Copy link below the form keeps your current inputs so you can share the scenario or save it for later.