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Pregnancy Weight Gain Calculator

See the recommended pregnancy weight gain range based on your pre-pregnancy BMI.

Results update as you type.

Recommended gain

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Educational estimate only — not medical advice. Talk to a healthcare professional about your health.

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Quick answer

At 5'5" and 140 lb (BMI 23.3, normal), the recommended gain is 25–35 lb for a single pregnancy.

How it works

The Institute of Medicine recommends different gain ranges depending on your pre-pregnancy BMI. Most gain happens in the second and third trimesters.

Formula

BMI = weight ÷ height² × 703, then look up the IOM range for that BMI category

Assumptions & limitations

  • Results are rounded for display.

Frequently asked questions

What if I'm outside the range?

Talk to your provider — they can tailor guidance to your health and pregnancy.