Pregnancy Weight Gain Calculator
See the recommended total gain for your pre-pregnancy BMI. The range is the 2009 IOM singleton guideline.
Result
Enter the values and press Calculate. Numbers outside the allowed range produce no result.
How is it calculated?
The range is wider at a low BMI and narrower in the obesity class. It is the expected gain during pregnancy, not a return to the starting weight.
BMI = pre-pregnancy weight ÷ height² The range follows the BMI class
Reference table
| Pre-pregnancy BMI | Total gain |
|---|---|
| < 18,5 | 12,5–18 kg |
| 18,5–24,9 | 11,5–16 kg |
| 25–29,9 | 7–11,5 kg |
| ≥ 30 | 5–9 kg |
How should you read the result?
Twins, triplets, nausea, edema and illness change the range. It does not produce supplement doses or a forbidden-food list.
Frequently asked questions
How much weight is gained in pregnancy?
About 11.5–16 kg if pre-pregnancy BMI was in the healthy range. The band changes with BMI class.
What if the first months show no gain?
Nausea can keep early weight flat. The range covers the whole pregnancy; one week does not decide it.
Is it the same for twins?
No. Twins have a separate, higher range. This tool is for a singleton pregnancy.
How much of the gain is fat?
Baby, placenta, fluid, blood and breast tissue are a large share. It is not all fat.