What Is the Pregnancy Weight Gain Calculator?
A clinical tracking tool for healthy maternal weight gain across all 40 weeks of gestation.
How Does the Pregnancy Weight Gain Calculator Work?
Calculates pre-pregnancy BMI and projects recommended weight gain bands across trimesters.
Pregnancy Weight Gain Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
IOM Clinical Gestational Guidelines based on Pre-Pregnancy BMI
Normal BMI mothers are advised to gain 11.5–16.0 kg total, with 0.4 kg/week in the second and third trimesters.
How to Use the Pregnancy Weight Gain Calculator
- Enter your pre-pregnancy weight, height, current gestational week, and singleton/twin status.
Step-by-Step Example Calculation
Normal BMI Mother at Week 20
Input Values:
preWeightKg:62
heightCm:165
currentWeek:20
isTwins:single
Worked Steps: Recommended gain of 3.4–5.4 kg by week 20.
Understanding Your Result
Displays target gain range for your current week and total 40-week target in kilograms and pounds.
Factors That Affect the Result
- Pre-pregnancy maternal BMI, single vs multiple pregnancy, morning sickness, and fluid retention.
When Should You Use This Calculator?
- Monitoring maternal progress during routine prenatal checkups.
Assumptions & Limitations
- Based on IOM population guidelines; individual obstetric conditions take precedence.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Institute of Medicine (IOM) clinical consensus benchmarks.