Pregnancy BMI Calculator
Check your pre-pregnancy BMI & recommended weight gain
Pregnancy changes your body in incredible ways. Knowing your pre-pregnancy BMI helps determine how much weight you should gain for a healthy pregnancy.
Our medically referenced Pregnancy BMI Calculator helps you:
✔ Calculate your Body Mass Index
✔ See recommended weight gain range
✔ Understand trimester weight goals
✔ Protect maternal and baby health
Always consult your OB-GYN for personalized advice.
CALCULATOR FEATURES (Advanced Version)
Dual Unit Support
- Metric (kg / cm)
- Imperial (lbs / feet/inches)
Pre-Pregnancy BMI Calculation
BMI = Weight (kg) ÷ Height² (m²)
WHO BMI Categories
- Underweight: < 18.5
- Normal: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obese: ≥ 30
Pregnancy Weight Gain Recommendations (ACOG Guidelines)
| BMI Category | Recommended Total Gain |
|---|---|
| Underweight | 12.5–18 kg |
| Normal | 11.5–16 kg |
| Overweight | 7–11.5 kg |
| Obese | 5–9 kg |
Trimester Breakdown Feature
Displays:
- 1st trimester: 0.5–2 kg total
- 2nd & 3rd trimester: weekly gain estimate
Progress Tracker (Optional Advanced Feature)
User can input current weight → shows:
- Weight gained so far
- If within recommended range
FAQ
Is BMI accurate during pregnancy?
BMI should be calculated using pre-pregnancy weight. During pregnancy, weight gain varies naturally.
How much weight should I gain during pregnancy?
It depends on your BMI category. Normal BMI women typically gain 11.5–16 kg.
What if I am overweight before pregnancy?
Lower weight gain ranges are recommended to reduce risks like gestational diabetes.
Can I lose weight during pregnancy?
Weight loss is generally not recommended unless supervised by a doctor.
