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Pregnancy Weight Gain Calculator
View the reference range for total weight gain in a singleton pregnancy based on prepregnancy BMI.
- Lower total-gain reference, kg
- 11.3
- Upper total-gain reference, kg
- 15.9
- Current gain, kg
- 5
- Prepregnancy BMI
- 22
How the calculation works
Prepregnancy BMI = kg/m². Total gain reference ranges are 28–40, 25–35, 15–25, or 11–20 lb depending on BMI category.
Inputs
- Prepregnancy weight, kg
- Height, cm
- Current weight, kg
Calculation details
These are CDC/IOM reference ranges for one baby and BMI below 40. Twins, adolescent pregnancy, and special health conditions need individual assessment.
The range applies to the whole pregnancy, not the current week. Current gain is not classified as appropriate or excessive without gestational age and clinical context.
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Sources
Updated: 2026-10-02