BMI Pregnancy Calculator

Track your healthy weight gain during pregnancy with our free BMI calculator. By using your pre-pregnancy weight, you can find your BMI and the recommended total weight gain range for you and your baby. Use this tool to monitor your progress and discuss it with your healthcare provider. Explore more health tools on CalculatorBolt.

Calculate Your BMI & Weight Gain

Your height
Weight before pregnancy
0-42 weeks
Leave empty to skip tracking

Notes

Twin/Multiple Pregnancy: Weight gain recommendations for twin or multiple pregnancies are significantly higher than for singleton pregnancies. This calculator is designed for single-baby pregnancies. Please consult your healthcare provider for personalized guidance on multiples.

Trimester Breakdown

Calculate your BMI first to see the typical weight gain distribution across trimesters.

Export

How to Use This Calculator

Enter your height and your weight before you got pregnant to calculate your pre-pregnancy BMI. Then, add your current week of pregnancy to see the recommended total weight gain. For tracking, you can also input your current weight to see how you're progressing.

Understanding BMI and Pregnancy Weight Gain

Your pre-pregnancy Body Mass Index (BMI) helps healthcare providers determine a healthy weight gain goal for your pregnancy. Gaining the right amount of weight supports your baby's growth and reduces health risks for both of you. The recommendations are a general guide, as every pregnancy is unique.

Example

A person who is 5'5" (165 cm) and had a pre-pregnancy weight of 140 lbs (63.5 kg):

  • Pre-pregnancy BMI: 23.3 (Normal Weight)
  • Recommended Total Weight Gain: 25 - 35 lbs (11.3 - 15.9 kg)
  • At 25 weeks, a weight gain of around 15 lbs would be within the recommended range.

Tips & Important Notes

  • Consult Your Doctor: Always discuss your weight gain and nutritional needs with your doctor or midwife.
  • Focus on Nutrition: Weight gain comes from the baby, placenta, increased blood volume, and stored fat. Focus on a balanced diet rather than just the number on the scale.
  • Every Woman is Different: These are guidelines. Your individual weight gain pattern may vary.

FAQs

Your pre-pregnancy BMI is the standard baseline used by medical organizations to set healthy weight gain goals for the pregnancy.

The recommended weight gain for multiple pregnancies is significantly higher. This calculator is designed for singleton pregnancies; please consult your doctor for guidance on multiples.

It is generally not recommended to lose weight during pregnancy, especially if you were in the normal or underweight BMI category. Always consult your healthcare provider.

No. All calculations are performed in your browser. You can use the Share Link feature to save your settings.

Disclaimer

This calculator is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. The weight gain recommendations are based on general guidelines and may not be suitable for everyone. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or your pregnancy.

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Author: CalculatorBolt Editorial Team
Reviewed by: Obstetrician/Gynecologist
Published: • Updated: