Pregnancy Weight Gain Calculator
Find your recommended total pregnancy weight gain range based on your pre-pregnancy BMI, per Institute of Medicine guidelines.
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Your result
11.5 kg
Recommended gain (low)
AI explanation
Formula
Total gestational weight gain range looked up by pre-pregnancy BMI category (IOM 2009 guidelines, singleton pregnancy)Worked example
60kg, 165cm
| Field | Value |
|---|---|
| Pre-pregnancy weight | 60 |
| Height | 165 |
| Pre-pregnancy BMI category | Normal |
| Recommended gain (low) | 11.5 |
| Recommended gain (high) | 16 |
Assumptions
- Uses the U.S. Institute of Medicine (IOM) 2009 guidelines for a singleton (single-baby) pregnancy — twins or higher-order multiples have different, higher recommended ranges.
- Pre-pregnancy BMI is calculated the same way as the standard BMI Calculator.
- Informational only — your healthcare provider may recommend a different target based on your individual health history.
Frequently asked questions
How much weight should I gain during pregnancy?
It depends on your pre-pregnancy BMI: roughly 11.5-16 kg for a normal BMI, more for underweight (12.5-18 kg), and less for overweight (7-11.5 kg) or obese (5-9 kg) pre-pregnancy BMI, per IOM guidelines for a single baby.
Why does the recommended gain depend on pre-pregnancy weight?
Women who start pregnancy at a higher weight generally need to gain less to support a healthy pregnancy, while those starting underweight benefit from gaining more.
Do twin pregnancies have different guidelines?
Yes — twin and higher-order multiple pregnancies have higher recommended weight gain ranges than this calculator's single-baby figures; ask your healthcare provider for guidance specific to a multiple pregnancy.
Related calculators
Sources
- Weight Gain During Pregnancy: Reexamining the Guidelines — National Academies (Institute of Medicine). Effective 28-05-2009, reviewed 13-09-2026.
This calculator provides a general estimate only and does not constitute personalized medical advice. Always follow your healthcare provider's specific guidance for your pregnancy.
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