When does pregnancy weight gain start?

Most weight gain occurs in the second and third trimesters. The first trimester typically sees only 0.5–2 kg of total gain (or even weight loss if experiencing morning sickness).

What makes up pregnancy weight gain?

Baby (~3.4 kg), placenta (~0.7 kg), amniotic fluid (~0.8 kg), breast tissue (~0.9 kg), blood volume (~1.8 kg), uterus enlargement (~0.9 kg), fluid and fat stores (~3 kg).

Is losing weight during pregnancy safe?

Small weight loss in the first trimester due to morning sickness is common. Significant weight loss during pregnancy should be discussed with your doctor immediately.

Pregnancy Weight Gain Calculator

The Pregnancy Weight Gain Calculator estimates your recommended total weight gain during pregnancy based on your pre-pregnancy BMI, following the Institute of Medicine (IOM) guidelines. Gaining the right amount of weight during pregnancy supports your baby's growth while reducing risks of complications for both mother and child.

Pre-Pregnancy Weight(kg)

Height(cm)

Current Trimester

How to Use This Calculator

1
Enter your pre-pregnancy weight in kilograms.
2
Enter your height in centimetres.
3
Select your current trimester.
4
Click Calculate to see your expected weight gain at this stage.

Frequently Asked Questions

IOM guidelines: Underweight (BMI<18.5): 12.5–18 kg; Normal (18.5–24.9): 11.5–16 kg; Overweight (25–29.9): 7–11.5 kg; Obese (BMI≥30): 5–9 kg.

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