Pregnancy Weight Gain Calculator

Track healthy weight gain throughout pregnancy

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Medical Disclaimer: This tool is for educational and informational purposes only. It does not provide medical advice, diagnosis, or treatment. Results are estimates only. Always consult a qualified healthcare professional for medical decisions. In an emergency, call 995 (Singapore) immediately.

Recommended Weight Gain by Pre-Pregnancy BMI

IOM/ACOG guidelines for singleton pregnancies.

BMI Category	Pre-preg BMI	Total Gain	2nd/3rd Tri Rate
Underweight	< 18.5	12.5–18 kg	0.5 kg/week
Normal weight	18.5–24.9	11.5–16 kg	0.4 kg/week
Overweight	25–29.9	7–11.5 kg	0.3 kg/week
Obese	≥ 30	5–9 kg	0.2 kg/week

For twin pregnancies, total gain is typically 5–7 kg higher. Always follow your obstetrician's individual guidance.

Where Does Pregnancy Weight Go?

Baby 3.2–3.8 kg

Placenta 0.7–0.8 kg

Amniotic fluid 0.8–1.0 kg

Uterus growth 0.9–1.0 kg

Blood volume increase 1.3–1.5 kg

Breast tissue 0.5–1.5 kg

Body fat stores 2.5–3.5 kg

Fluid retention 1.0–2.5 kg

Weight gain is essential for a healthy pregnancy. Very low weight gain is linked to preterm birth and low birth weight. For nutrition guidance, visit the Pregnancy Hub →