Pregnancy Weight Gain Calculator
Find the recommended total weight gain range for your pregnancy from your pre-pregnancy body mass index and whether you carry one baby or twins.
Recent
Formula
How the calculation works
Enter your weight just before pregnancy, your height and whether you are expecting one baby or twins.
The tool computes your pre-pregnancy BMI and places you in the underweight, normal, overweight or obese category.
It then shows the total gain range recommended for that category, based on the Institute of Medicine guidance used worldwide.
Common mistakes
- Applying the single-baby range to a twin pregnancy, because twins normally call for a larger gain of about 17 to 25 kg in the normal BMI group.
- Aiming to diet during pregnancy to limit gain, since pregnancy is not the time for weight loss and restriction can harm the baby.
When to use it
- Use it early in pregnancy to know the healthy total gain to aim for and to discuss it with your doctor.
- Use it to check whether your current gain is tracking the range for your pre-pregnancy BMI category.
Worked example
A pre-pregnancy weight of 55 kg and a height of 160 cm give a BMI of about 21.5, which is in the normal range, so the recommended total gain for a single baby is about 11.5 to 16 kg.
Common questions
How much weight should I gain in pregnancy?
For a normal pre-pregnancy BMI the recommended total gain is about 11.5 to 16 kg for one baby, while underweight women gain more and obese women gain less.
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