Pregnancy Weight Gain Calculator
Weight gain during pregnancy is a normal and necessary part of a healthy pregnancy. The recommended amount depends on your pre-pregnancy BMI. Guidelines from the Danish Health Authority and WHO recommend different ranges. Typical weight gain is 10–15 kg for normal-weight women.
Recommended Weight Gain by BMI
For women with a normal BMI (18.5–24.9), the recommended total is 11.5–16 kg. Underweight women (BMI below 18.5) should gain 12.5–18 kg. Overweight women (BMI 25–29.9) should gain 7–11.5 kg, and obese women (BMI 30+) should gain 5–9 kg. In the first trimester (weeks 1–12), gain is often minimal (0.5–2 kg), while from week 20 it is typically 150–200 g per week.
Where Does the Weight Go?
The weight consists of the baby (3–4 kg), placenta (0.5–1 kg), amniotic fluid (1 kg), increased blood volume (1.5 kg), uterus growth (1 kg), breast tissue (0.5–1 kg), fat stores (2–4 kg), and extra fluid (1–2 kg).
Important Information
Weight gain is individual — the most important thing is a healthy diet, not "eating for two." The body only needs an extra 300 kcal per day. Excessive gain can increase the risk of gestational diabetes. Do not diet while pregnant.