Obstetrics · Weight gain
BMI & Weight Gain Calculator
Calculate pre‑pregnancy BMI and see the recommended total and weekly gestational weight gain for that BMI category.
Your details
Use your weight and height from just before this pregnancy.
Please enter a valid height and weight.
Recommended total gain
Rate, 2nd/3rd trimester
| Pre‑pregnancy BMI | Category | Total gain (singleton) | Total gain (twins) |
|---|---|---|---|
| < 18.5 | Underweight | 12.5–18 kg | Insufficient data |
| 18.5–24.9 | Normal weight | 11.5–16 kg | 17–25 kg |
| 25.0–29.9 | Overweight | 7–11.5 kg | 14–23 kg |
| ≥ 30.0 | Obese | 5–9 kg | 11–19 kg |
Estimate only. These ranges are population guidelines, not individual targets — your own ideal weight gain can vary depending on your health, this pregnancy, and any conditions such as diabetes. Please discuss your weight gain plan with Dr McCaffrey.
Weight gain ranges: Institute of Medicine (US), Rasmussen KM, Yaktine AL, eds. Weight Gain During Pregnancy: Reexamining the Guidelines, National Academies Press, 2009. Reference: Mercy Perinatal Toolkit.