Pregnancy Weight Gain Calculator
Recommended total pregnancy weight gain based on pre-pregnancy BMI.
Formula: IOM pregnancy weight gain guidelines
Worth Knowing
The recommended ranges here come from the Institute of Medicine and are keyed to your pre-pregnancy BMI, because someone starting underweight benefits from gaining more while someone starting with a higher BMI is advised to gain less. The guidance reflects outcomes for both mother and baby, not appearance. Weight gain is also expected to be uneven — minimal in the first trimester, then steadier through the second and third — so the total figure matters more than week-to-week changes.
How to Use
- Enter Pre-pregnancy weight into the first field of the Pregnancy Weight Gain Calculator.
- Fill in the rest: Height.
- Your result appears instantly as you type — there's no submit button or page reload.
Formula
IOM pregnancy weight gain guidelines