Pregnancy Weight Gain Calculator

Healthy weight gain in pregnancy is a range, not a target, and it depends on where you started. This shows what is typically recommended for your week.

Pre-pregnancy weight (kg)Height (cm)Current weekWeight gained so far (kg, optional)

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How it's calculated

We work out your pre-pregnancy BMI, then apply the Institute of Medicine guidelines: more for those who started lighter, less for those who started heavier, building gradually after the first trimester.

How to read your result

Gain rarely arrives evenly, and a week above or below the range is normal. What matters is the overall trend across your pregnancy. Your midwife or doctor knows your full picture and guides what is right for you.

Common questions

Is it bad if I am outside the range?

Not necessarily. Gain is uneven, and the trend matters more than any single week. Persistent large deviations are worth discussing with your care team.

How much weight gain is normal in the first trimester?

Does the guidance change for twins?

Method: Institute of Medicine (IOM) pregnancy guidelines.