Pregnancy Weight Gain Calculator

Category: Pregnancy
- April 07, 2025
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Calculate recommended pregnancy weight gain based on your pre-pregnancy BMI and other factors. This calculator follows guidelines from the American College of Obstetricians and Gynecologists (ACOG).

Personal Information

kg

Additional Factors

About Pregnancy Weight Gain

Healthy weight gain during pregnancy supports the growth and development of your baby. The recommended amount varies based on your pre-pregnancy Body Mass Index (BMI) and whether you're carrying multiples.

Weight Gain Recommendations by BMI
  • Underweight (BMI < 18.5): 12.5-18 kg (28-40 lbs)
  • Normal weight (BMI 18.5-24.9): 11.5-16 kg (25-35 lbs)
  • Overweight (BMI 25-29.9): 7-11.5 kg (15-25 lbs)
  • Obese (BMI ≥ 30): 5-9 kg (11-20 lbs)
For Multiple Pregnancies
  • Twins:
    • Normal BMI: 16.8-24.5 kg (37-54 lbs)
    • Overweight: 14-22.7 kg (31-50 lbs)
    • Obese: 11-19 kg (25-42 lbs)
  • Triplets or more: Recommendations vary; consult with your healthcare provider
Weight Gain Timeline
  • First Trimester: 0.5-2 kg (1-4 lbs) total
  • Second and Third Trimesters:
    • Underweight: About 0.5 kg (1 lb) per week
    • Normal weight: About 0.4 kg (0.8 lb) per week
    • Overweight: About 0.3 kg (0.6 lb) per week
    • Obese: About 0.2 kg (0.5 lb) per week
Important Notes
  • These are general guidelines. Your healthcare provider may recommend different weight gain goals based on your individual health factors.
  • Weight gain should be gradual throughout pregnancy.
  • Both too little and too much weight gain can lead to complications.
  • Focus on a balanced, nutritious diet rather than restricting calories during pregnancy.
  • Regular prenatal visits help monitor your weight gain and overall health.

Understanding Pregnancy Weight Gain Calculator

The Pregnancy Weight Gain Calculator helps you monitor healthy weight gain throughout your pregnancy based on your pre-pregnancy Body Mass Index (BMI), current pregnancy week, and whether you're expecting one baby or multiples. This calculator is based on recommendations by the American College of Obstetricians and Gynecologists (ACOG).

Maintaining a healthy weight during pregnancy supports your baby’s growth and lowers the risk of complications. By using this pregnancy weight tracker, you gain personalized insights into your recommended weight gain and progress.

BMI Calculation Formula:
BMI = Weight (kg) / Height² (m²)

How to Use the Calculator

  • Enter your pre-pregnancy weight and select the unit (kg or lbs).
  • Enter your height in cm or feet/inches.
  • Select the pregnancy type: single baby, twins, or triplets.
  • Provide your current pregnancy week (1–42).
  • (Optional) Input your current weight to track your actual progress.
  • You can also include age, activity level, and whether it’s your first pregnancy for additional context.
  • Click "Calculate Weight Gain" to view results and chart.

What the Calculator Shows

  • Your calculated pre-pregnancy BMI and category (e.g., Normal, Overweight).
  • The recommended total weight gain based on BMI and pregnancy type.
  • Estimated weekly weight gain for the second and third trimesters.
  • Expected weight at term based on healthy gain patterns.
  • (If current weight is entered) A breakdown of your current progress and whether you’re on track.
  • Trimester-specific weight gain breakdown.
  • A helpful weight gain chart for visual comparison over 40 weeks.
  • A detailed explanation of where the weight goes during pregnancy.

Why This Tool is Useful

This pregnancy weight guide is ideal for expecting parents who want to make informed, health-conscious decisions. It can be a helpful companion alongside tools like a due date calculator, pregnancy week calculator, or fertility calendar to support pregnancy planning and tracking.

Using the pregnancy weight calculator regularly can help you:

  • Track pregnancy gain in a structured way.
  • Spot trends early and adjust lifestyle habits.
  • Estimate baby arrival weight range.
  • Understand what healthy weight gain looks like for your body and pregnancy type.

Frequently Asked Questions (FAQ)

How accurate is this calculator?

The calculator is based on guidelines from ACOG. It provides a general range, but every pregnancy is unique. Always consult your healthcare provider for specific advice.

Can I use this if I’m carrying twins or triplets?

Yes. The tool includes weight gain recommendations for twins and general guidance for triplets or more. For higher-order pregnancies, direct consultation with a doctor is best.

Do I need to enter my current weight?

It’s optional. However, entering your current weight allows the calculator to assess your progress and provide a projected weight at term.

How often should I use this tool?

You can use it anytime you want to check your progress—especially helpful after prenatal visits or monthly check-ins.

Is this calculator related to period or ovulation tracking?

While this tool focuses on pregnancy weight insights, it complements others like a period calculator to track your cycle or a fertile window tool to predict ovulation. These tools together can support every stage—from planning to delivery.

Additional Tips

  • Use the chart to visually compare your weight gain with the recommended range.
  • Combine this tool with a pregnancy timeline tool or baby arrival predictor for a complete overview.
  • Focus on steady, gradual weight gain and a balanced diet.

Whether you're planning ahead with a conception date tool or actively monitoring your journey, this calculator offers helpful, evidence-based feedback to support a healthy pregnancy.