Pregnancy Weight Gain Calculator (IOM Guidelines)

Your details

Your height before pregnancy.
cm
Your weight before you became pregnant (used to calculate pre-pregnancy BMI).
kg
Your weight today.
kg
How many weeks pregnant you are (1-42).
weeks
Weight gained so farExcessive gain
7

Difference between current weight and pre-pregnancy weight

Pre-pregnancy BMI23.9kg/m²
BMI categoryNormal weight
Recommended total gain (min)11.5
Recommended total gain (max)16
Expected gain at this week4.2
Gain statusAbove recommended range (excessive)
Recommended weekly rate (2nd + 3rd trimester)0.42
7 kg gained
Too low<5On track5-16High16-20Excessive20+

Your gain of 7.0 kg is above the IOM range for week 20.

  • Your pre-pregnancy BMI puts you in the Normal weight category. The IOM recommends a total gain of 11.5 to 16.0 kg for your category.
  • At week 20, the IOM midline expectation is roughly 4.2 kg. You have gained 7.0 kg so far.
  • Excessive gestational weight gain is linked to larger babies, gestational diabetes, hypertensive disorders, and difficulty losing weight after birth. Talk to your care provider about diet and activity adjustments.
  • These guidelines are population averages. Your care provider may set a different goal based on your individual health history.

Next stepYour care provider is the best person to interpret your weight gain pattern alongside blood pressure, fundal height, fetal movement, and nutrition history.

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