Pregnancy Weight Gain Calculator
Calculate the recommended total and weekly weight gain limits based on pre-pregnancy BMI.
Input Parameters
Enter details for calculation.
Recommended Weight Gain
Expert Tip
Underweight (BMI < 18.5) target: 12.5–18 kg. Normal weight (18.5–24.9) target: 11.5–16 kg. Overweight (25–29.9) target: 7–11.5 kg. Obese (≥ 30) target: 5–9 kg.
Calculation Methodology & Details
Formula
Guidelines are set by the National Academy of Medicine to optimize fetal development and postpartum health.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How Pregnancy Weight Gain is Targeted
Follow these steps to use this calculator:
Enter Pre-pregnancy BMI
Input your BMI prior to becoming pregnant.
View Targets
Read recommended range and weekly rate during trimesters 2 and 3.
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ℹ️ About this Calculation
This obstetrics and gynecology calculator provides accurate gestational dating, fetal biometry estimations, risk stratification, and maternal health tracking based on ACOG guidelines and clinical ultrasonography standards.
Variable Glossary
Clinical Parameters
Last menstrual period (LMP), ultrasound biometric measurements (CRL, BPD, AC, FL), or lab hCG levels.
Obstetric Metrics
Estimated due date (EDD), gestational age in weeks/days, fetal growth percentiles, and risk scores.
How to Calculate Step-by-Step
Step 1
Enter your last menstrual period (LMP) date or ultrasound biometry values.
Step 2
Select cycle length parameters or maternal clinical characteristics if required.
Step 3
Review calculated due date timeline, milestone projections, or risk scores immediately.