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Pregnancy Weight Gain Calculator

See the recommended pregnancy weight gain for your pre-pregnancy BMI using 2009 Institute of Medicine guidelines.

How to use

See the recommended weight gain during pregnancy based on your pre-pregnancy BMI, using the 2009 Institute of Medicine guidelines for single-baby pregnancies. Enter your height, pre-pregnancy weight and optionally your pregnancy week to see the range expected so far. These ranges are guidance only, and your care team may advise differently.

Enter your details.
Results update instantly.
Adjust the values to see how they change.

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Frequently asked questions

What are the IOM guidelines?

For a single baby, total gain is 12.5–18 kg for underweight, 11.5–16 kg for normal weight, 7–11.5 kg for overweight and 5–9 kg for obese pre-pregnancy BMI, with about 0.5–2 kg gained in the first trimester.

Does this apply to twins?

No. Recommendations for twins are different, so ask your doctor or midwife.

Is it free?

Yes. Everything is free, with no sign-up and no limits.

Is my data stored or sent?

No. Calculations run in your browser and nothing you enter is sent or stored.

Can I rely on these results?

They use standard published formulas and give estimates for general information.

For general information only. This is not medical advice. Talk to your doctor, midwife or dietitian about your own situation.