Pregnancy Weight Gain Calculator: Week by Week Breakdown

Your details

Your height in feet (the whole number part).
ft
The remaining inches after the feet part.
in
Your weight before becoming pregnant.
lb
How many weeks pregnant you are right now (1-42).
weeks
Your weight today. Leave at 0 to skip the comparison and see recommended targets only.
lb
BMI categoryNormal weight (IOM)
Normal weight

Your IOM weight gain classification based on pre-pregnancy BMI

Pre-pregnancy BMI23.3kg/m²
Total recommended gain (min)25
Total recommended gain (max)35
Gain target at week (min)7.1
Gain target at week (max)11.5
Recommended weekly rate (T2/T3)0.8-1.0 lb/week
23.3 kg/m²
Underweight<18.5Normal18.5-25Overweight25-30Obese30+
Week target (min)7.1
Week target (max)11.5
Total target (min)25
Total target (max)35

Week 20: second trimester - steady weekly gain is the goal.

  • Your pre-pregnancy BMI is 23.3, placing you in the "Normal weight" category under IOM 2009 guidelines.
  • At week 20, the recommended cumulative gain is 7.1 to 11.5 lb.
  • Over the full pregnancy you should gain 25 to 35 lb total.
  • These are population-level ranges. Your provider may set personalised targets based on your health history.

Next stepTrack your weight at the same time of day, once a week, to keep the trend meaningful.

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