🤰Pregnancy Weight Gain Calculator
e.g. 22.5
1–40
Recommended pregnancy weight gain is based on pre-pregnancy BMI, as established by the Institute of Medicine (IOM) 2009 guidelines. Gaining too little weight increases the risk of low birth weight; gaining too much increases risks of gestational diabetes, caesarean delivery, and postpartum weight retention.
- 1IOM recommends different total weight gain ranges based on pre-pregnancy BMI
- 2First trimester gain: typically 1.1–2.2 kg (0.5–1 kg/month)
- 3Second and third trimester: 0.2–0.5 kg/week depending on BMI category
| Pre-pregnancy BMI | Total Gain (singleton) | Rate in 2nd/3rd Trimester |
|---|---|---|
| Underweight (< 18.5) | 12.7–18.1 kg | 0.51 kg/week |
| Normal weight (18.5–24.9) | 11.3–15.9 kg | 0.42 kg/week |
| Overweight (25.0–29.9) | 6.8–11.3 kg | 0.28 kg/week |
| Obese (≥ 30.0) | 5.0–9.1 kg | 0.22 kg/week |
| Twin pregnancy (normal) | 16.8–24.5 kg | Higher across all BMI |
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