Pregnancy weight gain
Pregnancy weight gain calculator
Enter your height and your weight before pregnancy to see the recommended gain, and add this week's weight to check your progress.
Updated
In short
How much weight should I gain during pregnancy?
It depends on your BMI before pregnancy. The IOM guidelines, which ACOG follows, recommend 12.5 to 18 kg (28 to 40 lb) if underweight, 11.5 to 16 kg (25 to 35 lb) at a healthy weight, 7 to 11.5 kg (15 to 25 lb) if overweight and 5 to 9 kg (11 to 20 lb) with obesity, for one baby. Twins need more.
Your estimate
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This is an estimate, not a diagnosis or birth control.
General information, not medical advice. Your doctor or midwife can tell you what your own results mean.
How it's calculated
- BMI = weight before pregnancy in kg ÷ (height in m)².
- Total and weekly ranges come straight from the IOM 2009 table for your BMI group.
- By week: up to week 13, a share of the 0.5 to 2 kg (1.1 to 4.4 lb) IOM expects in the first trimester; from week 14, the rest of your total range spread evenly to week 40.
- BMI is a rough guide. Your doctor or midwife may advise differently.
Gyne learns your real cycle and adjusts these estimates as you log.
Frequently asked questions
How much weight should I gain in the first trimester?
Not much: the IOM guidelines assume about 0.5 to 2 kg (1.1 to 4.4 lb) in total. Most of the gain comes in the second and third trimesters.
How much weight should I gain with twins?
IOM's provisional ranges are 17 to 25 kg (37 to 54 lb) at a healthy weight, 14 to 23 kg (31 to 50 lb) if overweight and 11 to 19 kg (25 to 42 lb) with obesity.
Should I diet if I'm gaining too much?
Don't start a diet in pregnancy without advice. Ask your doctor or midwife, who can help with eating and activity that are safe for you and the baby.
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