Slimming World and The Royal College of Midwives, working together to help women successfully manage their weight before, during and after one of the most exciting events in their lives
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A healthy pregnancy: Check your BMI

check your BMI range

A healthy pregnancy: check your BMI.

Slimming World and the Royal College of Midwives, working together to help women successfully manage their weight before, during and after one of the most exciting events in their lives

Body Mass Index is a handy guide to the healthy weight range for your height, used by the government and health professionals. The weight range chart below displays BMI ranges in an easy chart version so you can quickly find which range you are in. Use the weight range chart below to check whether your health is at risk because of your weight.

If you are a mum-to-be the weight range chart can be used to look at the range you were in at the start of your pregnancy (at or before your booking appointment). It is not suitable to assess your weight after this point as it becomes inaccurate as you gain weight through your pregnancy.  

 

How to use the weight range chart

Line up your height (vertical) measurement, and then your weight (horizontal) measurement. Where the lines cross is where you are in the weight range.

See the colour key below for more information.

Check your BMI.

 

What range am I in?

In this range you are underweight

  • You may not be eating enough food to supply your own body and your growing baby with the
    nutrients you both need
  • Being underweight and trying to stay within this range can be unhealthy
  • It is important to eat a healthy balanced diet and to try to gain weight

The healthiest weight range

  • You are at least risk of developing weight-related medical problems and having complications
    during your pregnancy and birth
  • For a healthy pregnancy it is important to follow a healthy, balanced diet and include some
    daily physical activity

In this range you may be at greater risk of developing weight-related health problems

  • Making small changes to your diet and becoming more active will help to reduce this risk and
    could also improve any existing health problems
  • Making healthy lifestyle changes now will help you avoid gaining excess weight during
    pregnancy, making it easier to achieve a healthy weight after giving birth

In this range your health is at greater risk

  • You are at increased risk of a number of weight-related complications during your pregnancy
  • Making changes to the foods you eat and becoming more active will help to reduce the
    health risk and will benefit both you and your baby
  • Making healthy lifestyle changes now will help you avoid gaining excess weight during
    pregnancy, making it easier to move towards a healthy weight after giving birth 

Please note: If you are a mum-to-be BMI and the weight range chart can be used to look at the range you were in at the start of your pregnancy (at or before your booking appointment). It is not suitable to assess your weight after this point as it becomes inaccurate as you gain weight through your pregnancy. The BMI weight range chart may not be accurate for people with a high muscle mass. If you are under 16 years old the chart is not suitable to assess your weight range.

 

Discover more about how much weight you could gain during pregnancy...