Pregnancy Weight Gain Calculator

See the recommended weight gain range for your BMI category.

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How to Use the Pregnancy Weight Gain Calculator

  1. Enter your weight before pregnancy, in kg.
  2. Enter your height in cm.
  3. Enter your current week of pregnancy (1-40).
  4. Click Calculate to see your recommended gain range.

Formula

Pre-Pregnancy BMI = Weight ÷ Height² (m); Recommended gain range depends on BMI category (IOM guidelines)

Worked Example

A pre-pregnancy weight of 60kg and height of 165cm gives a BMI of 22 (normal), suggesting a total gain of 11.5-16 kg over the pregnancy.

About This Calculator

Recommended ranges follow general Institute of Medicine (IOM) guidelines by pre-pregnancy BMI category. Always confirm your personal target with your OB-GYN or midwife, as individual circumstances vary.

Frequently Asked Questions

How much weight gain is recommended during pregnancy?

Recommendations vary based on pre-pregnancy BMI, generally ranging from about 11-40 lbs across different starting weight categories.

Why do recommendations differ by starting BMI?

Guidelines aim for healthy outcomes for both mother and baby, and appropriate ranges differ for underweight, normal, overweight, and obese categories.

Should I strictly follow a weight gain calculator's numbers?

Use it as a general guideline, but always follow your own healthcare provider's personalized recommendations.

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