Every Toolkit

Pregnancy BMI Calculator

Calculate your pre-pregnancy BMI and track healthy weight gain during pregnancy

Your Information

Enter your measurements

Second Trimester (14-26 weeks)

Nutrition Tips

  • Eat a balanced diet with plenty of fruits and vegetables
  • Include lean proteins, whole grains, and dairy
  • Take prenatal vitamins with folic acid
  • Stay hydrated - drink 8-10 glasses of water daily
  • Eat small, frequent meals to manage nausea
  • Limit caffeine intake to 200mg per day
  • Avoid raw or undercooked foods
  • Include iron-rich foods to prevent anemia

Your Results

Pre-Pregnancy BMI
23.9
normal
Current Gain
5.0 kg
Status
Below
Recommended Total Gain
11.5-16 kg
Expected at 20 Weeks
5.0 kg

Trimester Guidance

First Trimester (1-13 weeks)
Expected: 1-2 kg (2-4 lbs) total
Focus on folic acid, manage morning sickness, rest when needed
Second Trimester (14-26 weeks)
Expected: 0.5 kg (1 lb) per week
Energy increases, continue balanced diet, stay active
Third Trimester (27-40 weeks)
Expected: 0.5 kg (1 lb) per week
Eat smaller meals, focus on iron and calcium, prepare for delivery

Exercise Tips

  • Aim for 150 minutes of moderate exercise per week
  • Walking, swimming, and prenatal yoga are excellent
  • Avoid contact sports and activities with fall risk
  • Stay hydrated during exercise
  • Listen to your body and don't overexert
  • Avoid lying flat on your back after first trimester
  • Wear comfortable, supportive shoes
  • Consult your healthcare provider before starting new exercises

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BMI Categories & Weight Gain Guidelines

Underweight
BMI: < 18.5
12.5-18 kg (28-40 lbs)
Recommended gain
Normal Weight
BMI: 18.5-24.9
11.5-16 kg (25-35 lbs)
Recommended gain
Overweight
BMI: 25-29.9
7-11.5 kg (15-25 lbs)
Recommended gain
Obese
BMI: ≥ 30
5-9 kg (11-20 lbs)
Recommended gain

About Pregnancy Weight Gain

Why Weight Gain Matters

Appropriate weight gain during pregnancy is crucial for your baby's development and your health. Gaining too little can lead to low birth weight and premature birth, while gaining too much increases risks of gestational diabetes, high blood pressure, and delivery complications.

Where Does the Weight Go?

Baby: 3-4 kg (7-8 lbs)
Placenta: 0.7 kg (1.5 lbs)
Amniotic fluid: 0.9 kg (2 lbs)
Breast tissue: 0.9 kg (2 lbs)
Blood volume: 1.8 kg (4 lbs)
Fat stores: 2.7-3.6 kg (6-8 lbs)

Special Considerations

  • Twins: Recommended gain is 17-25 kg (37-54 lbs) for normal BMI
  • Adolescents may need to gain at the higher end of the range
  • Women with eating disorders need specialized care
  • Previous pregnancy complications may affect recommendations

Important Medical Disclaimer

This calculator provides general guidelines based on standard medical recommendations. Every pregnancy is unique, and your healthcare provider may recommend different targets based on your individual health, medical history, and pregnancy circumstances. Always consult with your obstetrician or midwife for personalized advice. If you have concerns about your weight gain or pregnancy health, contact your healthcare provider immediately.