Pregnancy Weight Gain Calculator
Worked example result
| Pre-pregnancy BMI | 23.9 |
| BMI category | Normal weight (BMI 18.5-24.9) |
| Recommended total gain (IOM 2009) | 11.5-16 kg (25-35 lb) |
| Suggested rate, 2nd & 3rd trimester | 0.35-0.50 kg per week |
At 65 kg and 165 cm, pre-pregnancy BMI is 23.9 — normal weight — so the IOM 2009 recommendation is a total gain of 11.5–16 kg (25–35 lb), at about 0.35–0.50 kg per week in the second and third trimesters.
Pre-pregnancy BMI = weight ÷ height², then IOM 2009 ranges: <18.5 → 12.5–18 kg · 18.5–24.9 → 11.5–16 kg · 25–29.9 → 7–11.5 kg · ≥30 → 5–9 kg · Powered by CalcHub — Pregnancy Weight Gain Calculator