Pregnancy BMI Calculator
Enter your pre-pregnancy weight and height to calculate your BMI and see the recommended weight gain guidelines for a healthy pregnancy.
Your Pre-Pregnancy BMI Result
22.0
Normal WeightThis result helps estimate a healthy weight gain range for your pregnancy.
Recommended Weight Gain
Based on your BMI, you should aim to gain between 11.5 to 16 kg (25 to 35 lbs).
Note: This is a general guideline for a single pregnancy. If you are expecting multiples, your recommended weight gain will be different. Always consult your healthcare provider for personalized advice.
How to Use The Calculator in 3 Simple Steps
Follow this easy guide to find your pre-pregnancy BMI and personalized weight gain recommendations.
Step 1: Select Your Units
Choose the measurement system you're familiar with. Select 'Metric' for kilograms & centimeters or 'Imperial' for pounds, feet & inches.
Step 2: Enter Pre-Pregnancy Info
Enter your height and your weight from *before* you were pregnant. Using accurate numbers provides the most helpful results.
Step 3: View Your Custom Guide
Click the calculate button to see your BMI score, weight category, and the healthy weight gain range for your pregnancy journey.
Understanding Your BMI Category
Your pre-pregnancy BMI category is a starting point for a healthy pregnancy plan.
Underweight (BMI < 18.5)
Gaining enough weight is crucial to help your baby grow to a healthy size. Your doctor will recommend a higher weight gain range to ensure proper fetal development.
Normal Weight (BMI 18.5 - 24.9)
You are starting your pregnancy at a healthy weight. Following the recommended weight gain guidelines helps reduce the risk of complications like gestational diabetes and high blood pressure.
Overweight (BMI 25.0 - 29.9)
Your healthcare provider will suggest a slightly lower range of weight gain. The focus will be on nutrient-dense foods and regular, safe physical activity to support a healthy pregnancy.
Obese (BMI ≥ 30.0)
Gaining less weight is often recommended to minimize risks. Your doctor will work closely with you to create a personalized plan for nutrition and exercise to ensure the healthiest outcome for you and your baby.
Frequently Asked Questions
Why is pre-pregnancy BMI important?
Your pre-pregnancy BMI is a key indicator that helps your healthcare provider recommend a safe and healthy amount of weight for you to gain during pregnancy. Achieving this target range supports your baby's development and reduces the risk of pregnancy-related complications for you.
How is BMI calculated?
Body Mass Index (BMI) is calculated using a simple formula based on your height and weight. The formula is: BMI = weight (kg) / [height (m)]². Our calculator handles all the conversions and calculations for you, whether you use metric or imperial units.
Should I try to lose weight during pregnancy if my BMI is high?
No, it is generally not safe to try to lose weight while you are pregnant. Your baby relies on you for consistent nutrition to grow. Instead of dieting, focus on adopting a healthy, balanced eating plan and engaging in safe physical activity to manage your weight gain, as guided by your doctor.
Are the recommended weight gain ranges the same for everyone?
No, the ranges are personalized. They depend on your pre-pregnancy BMI and whether you're carrying a single baby, twins, or more. Women with a lower BMI are advised to gain more, while those with a higher BMI are advised to gain less. Always consult your doctor for your specific recommendation.
Important Disclaimer
The Mamma Track BMI calculator is an informational tool and is not a substitute for professional medical advice. The BMI categories and weight gain recommendations are based on standard guidelines for the general population.
Always consult with your doctor, midwife, or a qualified healthcare provider for personalized advice regarding your weight, nutrition, and health during pregnancy. Your individual needs may vary.
Mamma Track does not take responsibility for any medical decisions made based on the information provided here.