Pregnancy BMI and Gestational Weight Gain Calculator

Your details

Your height before pregnancy.
cm
Your weight before you became pregnant, or at the start of pregnancy.
kg
Your weight today.
kg
How many weeks pregnant you are right now.
weeks
Twin pregnancies have higher recommended weight gain ranges.
Pre-pregnancy BMIAbove target
23.9kg/m²

Your BMI before pregnancy, used to set the gain target.

Recommended total gain (min)11.5
Recommended total gain (max)16
Weight gained so far6
Recommended weekly gain (min)0.35
Recommended weekly gain (max)0.5
Gain status at this weekAbove target
Still to gain (min)5.5
Still to gain (max)10
23.9 kg/m²
Underweight<18.5Normal weight18.5-25Overweight25-30Obese30+

Pre-pregnancy BMI 23.9, Normal weight - gain 11.5 to 16.0 kg total.

  • Based on a pre-pregnancy BMI of 23.9 (Normal weight), IOM guidelines recommend a total gain of 11.5 to 16.0 kg.
  • You have gained 6.0 kg by week 20.
  • Your current gain is ahead of the expected pace. This does not necessarily require action, but mention it at your next prenatal visit.
  • In the second and third trimesters, the IOM recommends 0.35 to 0.50 kg per week for your BMI category.

Next stepYou are in the second trimester (week 20). These figures are screening guidance only. Always discuss your personal weight gain plan with your obstetrician, midwife, or registered dietitian.

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