Pregnancy Weight Gain Calculator

IOM-style recommended total weight-gain ranges by pre-pregnancy BMI category.

Pregnancy Weight Gain Calculator helps you iOM-style recommended total weight-gain ranges by pre-pregnancy BMI category. Enter pre-pregnancy bmi, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Pregnancy Weight Gain calculator does Pregnancy Weight Gain Calculator is built for body measurements, calories, and everyday health math. IOM-style recommended total weight-gain ranges by pre-pregnancy BMI category. You enter pre-pregnancy bmi, then Simple Calculators computes the result instantly. These tools use widely published formulas. They are educational screens, not a diagnosis. How the math works Enter your Pre-pregnancy BMI (body mass index: weight in kg ÷ height in metres²). The calculator places it in one of four bands — underweight (under 18.5), normal (18.5–24.9), overweight (25–29.9) or obese (30 and over) — and shows the Institute of Medicine (IOM) total-gain range for that band in kilograms and pounds. It also shows a typical weekly gain for the 2nd and 3rd trimesters. The ranges are for one baby; twins have different targets. The formula: Recommended gain = IOM range for your pre-pregnancy BMI band. Unde…