Pregnancy Weight Gain Calculator – Free Pregnancy BMI Calculator

Healthy baby development

Appropriate weight gain supports optimal fetal growth and development.

Reduce complications

Proper gain lowers risks of gestational diabetes and preeclampsia.

BMI-based guidelines

Recommendations adjust for underweight, normal, overweight, and obese categories.

Trimester breakdown

Understand expected gain patterns throughout pregnancy.

IOM guidelines

Based on Institute of Medicine evidence-based recommendations.

How much weight should I gain during pregnancy?

Normal BMI: 11.5-16 kg. Underweight: 12.5-18 kg. Overweight: 7-11.5 kg. Obese: 5-9 kg total.

How much weight in first trimester?

Most women gain 0.5-2 kg in first trimester. Some gain less due to morning sickness, which is normal.

How fast should I gain weight in second trimester?

Normal BMI: about 0.4 kg per week. Underweight: 0.5 kg/week. Overweight: 0.3 kg/week. Obese: 0.2 kg/week.

Is it bad to gain too much weight during pregnancy?

Excessive gain increases risks of complications, large baby, and difficulty losing weight postpartum.

What if I'm not gaining enough weight?

Insufficient gain may lead to low birth weight. Talk to your provider about nutrition strategies.