A worked example
A pre-pregnancy weight of 150 lb at 5'5" gives a BMI of about 25.0 — right at the normal/overweight boundary, with a recommended total gain in the 15-25 lb range.
Frequently asked questions
Why does the recommended range depend on pre-pregnancy weight?
Someone starting pregnancy underweight generally needs more total gain to support a healthy pregnancy, while someone starting at a higher weight has more existing reserves — the guidelines reflect that starting point rather than applying one number to everyone.
Is this range the same for twins?
No — twin and multiple pregnancies have separate, higher recommended ranges. This calculator covers singleton pregnancies only; talk to your provider for multiples.
What if I'm tracking below or above this range?
Some variation is normal, and weight gain often isn't perfectly linear across the pregnancy. Bring it up with your provider rather than trying to self-correct — they can assess your specific situation.
This calculator provides estimates for general informational purposes only and is not medical advice. Always follow your own healthcare provider's specific guidance.