Pregnancy Weight Gain Calculator

Calculate recommended pregnancy weight gain based on your pre-pregnancy BMI and track your progress throughout pregnancy.

Weight Information

kg
cm
kg

Leave empty if pre-pregnancy

Enter your pre-pregnancy weight, height, and current pregnancy status to see recommended weight gain ranges based on your BMI category.

Complete User Guide

What is Healthy Pregnancy Weight Gain?

Healthy weight gain during pregnancy is essential for both maternal and fetal health. The recommended amount of weight gain depends on your pre-pregnancy Body Mass Index (BMI). Weight gain supports your baby's growth, placenta development, increased blood volume, and prepares your body for breastfeeding.

The Institute of Medicine (IOM) provides guidelines for weight gain based on pre-pregnancy BMI categories. These recommendations help ensure optimal outcomes for both you and your baby.

Weight Gain by BMI Category

Underweight (BMI < 18.5)

Recommended gain: 12.5-18 kg (28-40 lbs)

Higher weight gain is recommended to support healthy fetal development and maternal health. Focus on nutrient-dense foods and regular meals.

Normal Weight (BMI 18.5-24.9)

Recommended gain: 11.5-16 kg (25-35 lbs)

Standard weight gain recommendations apply. Focus on balanced nutrition, regular physical activity, and gradual weight gain throughout pregnancy.

Overweight (BMI 25-29.9)

Recommended gain: 7-11.5 kg (15-25 lbs)

Moderate weight gain recommended. Focus on nutrient-dense foods, portion control, and regular physical activity as approved by your healthcare provider.

Obese (BMI ≥ 30)

Recommended gain: 5-9 kg (11-20 lbs)

Lower weight gain recommended. Consult with your healthcare provider for personalized guidance. Focus on quality nutrition and appropriate physical activity.

How to Use This Calculator

  1. Select your unit system (Metric or Imperial)
  2. Enter your pre-pregnancy weight (weight before becoming pregnant)
  3. Enter your height
  4. Enter your current weight (if you're already pregnant, otherwise leave as pre-pregnancy weight)
  5. Enter how many weeks pregnant you are (0 if pre-pregnancy)
  6. Click 'Calculate' to see recommended weight gain ranges and track your progress
  7. Review the charts to visualize your weight gain progress and compare with recommendations

Understanding Your Results

BMI Category

Your pre-pregnancy BMI category determines the recommended weight gain range. BMI is calculated using your pre-pregnancy weight and height.

Recommended Total Weight Gain Range

The total amount of weight you should gain throughout your entire pregnancy, based on your pre-pregnancy BMI. This is a range, and individual needs may vary.

Current vs Expected Gain

Compare your current weight gain with the expected gain for your current week of pregnancy. This helps you track if you're on target.

Weight Gain by Trimester

Weight gain patterns vary by trimester. First trimester typically sees minimal gain (0.5-2 kg), while second and third trimesters see more consistent weekly gains.

Status Assessment

Your status indicates whether your current weight gain is on track, below, or above recommendations. Always discuss significant deviations with your healthcare provider.

Weight Gain Patterns by Trimester

First Trimester (Weeks 1-13)

Minimal weight gain: 0.5-2 kg (1-4 lbs). Some women may even lose weight due to morning sickness. Focus on staying hydrated and eating small, frequent meals.

Second Trimester (Weeks 14-26)

Steady weight gain: approximately 0.35-0.5 kg (0.8-1 lb) per week for normal weight women. Baby is growing rapidly, and your body is preparing for delivery.

Third Trimester (Weeks 27-40)

Continued steady gain: similar to second trimester. Baby is gaining weight, and your body is storing nutrients for breastfeeding. Weight gain may slow slightly near the end.

Important Notes

  • These are general guidelines. Individual needs may vary based on multiple factors including age, activity level, medical conditions, and multiple pregnancies.
  • Weight gain is not linear. It's normal to have weeks with more or less gain. Focus on overall trends rather than day-to-day fluctuations.
  • Quality of nutrition matters more than quantity. Focus on nutrient-dense foods: fruits, vegetables, whole grains, lean proteins, and healthy fats.
  • This calculator is for informational purposes only and should not replace professional medical advice. Always consult with qualified healthcare providers (OB/GYN, midwife, or registered dietitian) for personalized guidance on pregnancy nutrition and weight management.
  • If you have concerns about your weight gain, significant deviations from recommendations, or medical conditions affecting weight, discuss with your healthcare provider immediately.

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