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Pregnancy Weight Gain Reference — result sheet
Show singleton-pregnancy weight-gain ranges from pre-pregnancy BMI and gestational week.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Classify BMI, apply the singleton total range, then add the category-specific second/third trimester weekly rate after week 13.
The result distinguishes total recommended gain from the approximate range accumulated by the entered week.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Pre-pregnancy BMI — minimum 12; maximum 60
- Gestational weeks — minimum 0; maximum 40
Worked example
| Input | Value |
|---|---|
| Pre-pregnancy BMI | 22 |
| Gestational weeks | 20 |
A normal pre-pregnancy BMI uses an 11.5 to 16 kg singleton total range.
Assumptions and limits
- Singleton pregnancy ranges from the 2009 National Academies guidance are used.
- This is reference information and not individualized obstetric advice.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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