Pregnancy Weight Gain Calculator
Healthy weight gain in pregnancy depends on your pre-pregnancy BMI — one range does not fit all. This free calculator uses the published IOM 2009 ranges to show your total healthy gain range and the expected range at your current week.
Enter your details above and the result will appear here.
How to use
- Enter your weight before pregnancy and your height.
- Enter your current week.
- Your BMI category, total range and expected range for this week appear instantly.
Note
IOM 2009 total gain ranges: underweight 12.5 to 18 kg, normal 11.5 to 16 kg, overweight 7 to 11.5 kg, obese 5 to 9 kg, with first-trimester gain of about 0.5 to 2 kg and weekly ranges thereafter. Twins and other situations have different ranges — your care provider guidance comes first. Estimate only — not medical advice.