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BMI calculator

BMI, or body mass index, is one way of measuring whether you’re a healthy weight for your height.

The result gives an indication of whether you’re a healthy weight, and if not, how over- or underweight you are. BMI isn’t perfect because there are other things that you need to take into account when it comes to weight, but it’s a useful guide.

Simply enter your details into our calculator and you'll soon know if you're a healthy weight for your height.

Calculate your BMI

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Height
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What's your BMI? enter your details and find out!

Review your BMI range and category

You are in the underweight range with a BMI score of under 18.5

If you’re underweight, you may not be getting all the nutrients that your body needs. Different nutrients come from different foods – some give you energy and others help your body to grow, repair itself and function properly. Being seriously underweight can lead to health problems, such as osteoporosis and heart conditions.

Try to gain weight by eating a balanced diet with three meals a day and some healthy snacks between meals. Good examples are a handful of unsalted nuts or a pot of low-fat yogurt. Talk to a nurse at your GP practice for more advice about gaining weight in a healthy way.

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Review your BMI range and category

You're a healthy weight range with a BMI score of 18.5-24.9

If your BMI falls into this range, that’s great. It probably means you’re on the right track to preventing health problems, such as heart disease and type 2 diabetes. Carry on eating a healthy, balanced diet with plenty of fruit and veg, and exercise regularly. 

It’s also a good idea to watch out for your waist circumference as this can be another indicator of health risks. Aim to keep it less than 88cm (35 inches) if you’re a woman and under 102cm (40 inches) if you’re a man.

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Review your BMI range and category

You're in the overweight range with a BMI score of 25-29.9

Your BMI suggests that you’re overweight, which can increase your risk of health conditions, such as high blood pressure, heart disease and certain types of cancer. The good news is that there are steps you can start taking straight away to reduce the possibility of these becoming a problem for you. 

Start by cutting down how much fatty and sugary food you eat. And try to do 30 minutes of physical activity on five days each week.
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Review your BMI range and category

You're in the obese weight range with a BMI score of over 30.

If you fall into this category of BMI, you’re at a high risk of health conditions, such as heart disease, high blood pressure and type 2 diabetes. There are different grades of obesity and the greater your BMI, the greater your risk of these health problems.

It’s important that you try to lose some weight. The best way is to reduce the amount of fat and sugar in your diet and increase how much physical activity you do. Talk to your practice nurse for advice and more information.

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  • Limitations Limitations of BMI

    Although in general BMI is a useful measure of whether or not you’re a healthy weight, it isn’t appropriate for everyone. There are a number of groups of people that it doesn’t apply to.

    • Girls and boys develop differently and have different amounts of body fat at different ages. Therefore, a child’s age and sex are taken into account when looking at their BMI.
    • As we age, we tend to have more body fat and less muscle so BMI isn’t always suitable for older people.
    • Athletes and people with a lot of muscle may have a high BMI but actually not have much body fat. 
    • Pregnant women gain weight as a result of their developing baby. However, it’s still preferable to have a healthy BMI before becoming pregnant.
    • Certain ethnic groups, such as black or Asian, are at risk of certain health problems at a lower BMI than others. Speak to your GP for more information.
    We welcome your feedback on this topic
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An overview of your health

Find out how a Bupa health assessment can help you understand your health, identify future health risks, and offer practical advice for a healthier you.

An overview of your health

Find out how a Bupa health assessment can help you understand your health, identify future health risks, and offer practical advice for a healthier you.

How healthy are you?

Find out how healthy you are with a Bupa health assessment, and receive a personalised lifestyle action plan and health goals for a healthier, happier you.

Worried about your BMI?

Get a picture of your current health and potential future health risks with a Bupa health assessment. Find out more today.

Worried about your BMI?

Get a picture of your current health and potential future health risks with a Bupa health assessment. Find out more today.

About our health information

At Bupa we produce a wealth of free health information for you and your family. We believe that trustworthy information is essential in helping you make better decisions about your health and care. Here are just a few of the ways in which our core editorial principles have been recognised.

  • Information Standard

    We are certified by the Information Standard. This quality mark identifies reliable, trustworthy producers and sources of health information.
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    We hold the Crystal Mark, which is the seal of approval from the Plain English Campaign for clear and concise information.
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Our core principles

All our health content is produced in line with our core editorial principles – readable, reliable, relevant – which are represented by our diagram.

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The ‘3Rs’ encompass everything we believe good health information should be. From tweets to in-depth reports, videos to quizzes, every piece of content we produce has these as its foundation.

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In a nutshell, our information is jargon-free, concise and accessible. We know our audience and we meet their health information needs, helping them to take the next step in their health and wellbeing journey.

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We use the best quality and most up-to-date evidence to produce our information. Our process is transparent and validated by experts – both our users and medical specialists.

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We know that our users want the right information at the right time, in the way that suits them. So we review our content at least every three years to keep it fresh. And we’re embracing new technology and social media so they can get it whenever and wherever they choose.

Our accreditation

Don’t just take our word for it. Here are just a few of the ways in which the quality of our information has been recognised.

  • The Information Standard certification scheme

    You will see the Information Standard quality mark on our content. This is a certification programme, supported by NHS England, that was developed to ensure that public-facing health and care information is created to a set of best practice principles.

    It uses only recognised evidence sources and presents the information in a clear and balanced way. The Information Standard quality mark is a quick and easy way for you to identify reliable and trustworthy producers and sources of information.

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  • Plain English Campaign

    Our website is approved by the Plain English Campaign and carries their Crystal Mark for clear information. In 2010, we won the award for best website.

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    We have received a number of BMA awards for different assets over the years. Most recently, in 2013, we received a 'commended' award for our online shared decision making hub.

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If you have any feedback on our health information, we would love to hear from you. Please contact us via email: healthinfo@bupa.com. Or you can write to us:

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This information was published by Bupa's Health Information Team and is based on reputable sources of medical evidence. It has been reviewed by appropriate medical or clinical professionals. Photos are only for illustrative purposes and do not reflect every presentation of a condition. The content is intended only for general information and does not replace the need for personal advice from a qualified health professional. For more details on how we produce our content and its sources, visit the about our health information page.

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