BMI Calculator
Find out whether you’re a healthy weight for your height
Our information has been awarded the PIF tick for trustworthy health information.
Enter your height and weight to get your result
Your BMI result
<p class="f21">Your ideal weight is between $range </p>
<p class="f21"> Your ideal weight is between $range</p>
<p class="f21">Your ideal weight is between $range</p>
<p class="f21">Your ideal weight is between $range</p>
<p class="f21">Your ideal weight is between $range</p>
What your BMI result means
A BMI score of under 18.5 is classed as ‘underweight’.
If you’re underweight, you might not be getting the energy or nutrients that your body needs. This can make you tired, and exercising might feel hard. It can also put you at risk of health conditions such as osteoporosis (brittle bones) and fertility problems.
How to increase your weight safely:
Aim for three balanced meals a day. These should include carbohydrates, protein, and healthy fats. If you want to gain weight, you can also include some nutrient-dense snacks. Good examples include:
- a handful of unsalted nuts
- a pot of Greek yogurt
- peanut butter on wholegrain toast
Talk to a GP for more advice. You may also be referred to a dietitian to help you create a personalised meal plan.
Speak to a GP if you’re worried about your BMI
A doctor can help give more advice on any underlying reasons you may be underweight, or refer to a dietitian for further support.
What is BMI?
BMI (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 for how tall you are, and if not, how over or underweight you are.
BMI is a useful guide. However, it isn’t always the best measure to use because there are other things that you need to consider when it comes to weight.
Limitations of BMI
BMI readings may not be accurate for everyone. When determining how accurate your BMI score is, it’s important to consider the following.
Other ways to manage your health
We can help you track, manage or address any health concerns you might have.
Health subscriptions
Skip the worry and get GP, mental health and physio appointments fast with a 12 month subscription.
Health assessments
Our assessments look into your overall health and wellbeing, as well as future risks.
Advice on healthy eating
A balanced, nutritious diet is essential to enable your body to function properly.
Seven tips for a well-balanced diet
From how much protein you need a week to getting enough calcium.
Why does my body need carbohydrates?
Learn what carbohydrates are, where they come from and what our bodies need with Senior Specialist Dietitian, Maya Aboukhater.
Good and bad fats in the diet: what’s the difference?
Our Lead Dietitian, Niamh Hennessy, talks about the differences between good and bad fats in our diets.
Easy, nutritious meal ideas
Browse our easy and nutritious meal ideas to stay on track with your health and wellbeing goals.
What your BMI result means
A BMI score of between 18.5 and 24.9 is classed as a ‘healthy weight’.
Being a healthy weight can reduce your risk of developing health problems in the future, such as heart disease and type 2 diabetes.
Eating well will help you to maintain a healthy BMI. A balanced diet contains protein, fibre, and healthy fats to keep you fuller for longer. Reducing ultra processed foods can help too.
You can increase the amount of energy you use by staying physically active. This means doing 150 minutes of moderate exercise a week, including two sessions of strength training.
Health checks for peace of mind
Our health assessments look into your overall health and wellbeing as well as future risks risk of cancer, diabetes, heart issues and more.
What is BMI?
BMI (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 for how tall you are, and if not, how over or underweight you are.
BMI is a useful guide. However, it isn’t always the best measure to use because there are other things that you need to consider when it comes to weight.
Limitations of BMI
BMI readings may not be accurate for everyone. When determining how accurate your BMI score is, it’s important to consider the following.
Other ways to manage your health
We can help you track, manage or address any health concerns you might have.
Calories burned calculator
Work out how many calories you burn while doing a physical activity or exercise.
Health subscriptions
Skip the worry and get GP, mental health and physio appointments fast with a 12 month subscription.
Maintaining a healthy weight
Our expert information can help you manage your lifestyle and stay healthy.
Understanding your BMI
Find out more about what BMI means and what other measurements you can take.
What is a healthy weight in adults?
Find out why keeping to a healthy weight can help you reduce your risk of several health conditions.
Seven tips for a well-balanced diet
From how much protein you need a week to getting enough calcium.
Why is fibre important?
Specialist Dietitian, Iona Bell, explains why fibre’s important and how you can get more of it into your diet.
What your BMI result means
A BMI score of between 25 and 29.9 is classed as ‘overweight’.
This BMI category is associated with a higher risk of health conditions, such as high blood pressure, heart disease and certain types of cancer.
If you want to lose weight, it can be helpful to start with small changes to your eating habits. Choosing fewer high-calorie foods, such as sugary drinks and ultra processed foods like biscuits and crisps, can make a difference over time. Eating lots of fibre and protein can keep you feeling fuller for longer, which may help you manage portions.
Managing stress and sleeping well can also make it easier to eat well. Increasing your physical activity has many benefits and can help to you to use more energy each day.
Get a detailed look into your lifestyle
Our health assessments check your overall health and look for future risks of cancer, diabetes, and heart issues. You’ll also get a plan for the future.
What is BMI?
BMI (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 for how tall you are, and if not, how over or underweight you are.
BMI is a useful guide. However, it isn’t always the best measure to use because there are other things that you need to consider when it comes to weight.
Limitations of BMI
BMI readings may not be accurate for everyone. When determining how accurate your BMI score is, it’s important to consider the following.
Other ways to manage your health
We can help you track, manage or address any health concerns you might have.
Calories burned calculator
Work out how many calories you burn while doing a physical activity or exercise.
Health subscriptions
Skip the worry and get GP, mental health and physio appointments fast with a 12 month subscription.
Managing your weight
Find out what factors contribute to a healthy weight, and how you can create good habits.
What is a healthy weight for adults?
Find out why keeping to a healthy weight can help you reduce your risk of several health conditions.
Maintain weight loss sustainably
Get tips for a sustainable weight loss plan that can help you achieve the best long-term results.
Food portion size guide
To help take control of your weight, take a look at how much you need of each food group and what that looks like.
Seven tips for a well-balanced diet
From how much protein you need a week to getting enough calcium.
What your BMI result means
A BMI score of between 25 and 29.9 is classed as ‘overweight’.
This BMI category is associated with a higher risk of health conditions, such as high blood pressure, heart disease and certain types of cancer.
If you want to lose weight, it can be helpful to start with small changes to your eating habits. Choosing fewer high-calorie foods, such as sugary drinks and ultra processed foods like biscuits and crisps, can make a difference over time. Eating lots of fibre and protein can keep you feeling fuller for longer, which may help you manage portions.
Managing stress and sleeping well can also make it easier to eat well. Increasing your physical activity has many benefits and can help to you to use more energy each day.
Get help managing your weight
If you have a BMI over 27 and a weight-related condition
A Bupa GP can advise which weight loss medication is right for you. Plus, you’ll get lifestyle coaching and ongoing support to help track your progress.
What is BMI?
BMI (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 for how tall you are, and if not, how over or underweight you are.
BMI is a useful guide. However, it isn’t always the best measure to use because there are other things that you need to consider when it comes to weight.
Limitations of BMI
BMI readings may not be accurate for everyone. When determining how accurate your BMI score is, it’s important to consider the following.
Other ways to manage your health
We can help you track, manage or address any health concerns you might have.
Calories burned calculator
Work out how many calories you burn while doing a physical activity or exercise.
Health assessments
Our assessments look into your overall health and wellbeing, as well as future risks.
Health subscriptions
Skip the worry and get GP, mental health and physio appointments fast with a 12 month subscription.
Managing your weight
Find out what factors contribute to a healthy weight, and how you can create good habits.
What is a healthy weight for adults?
Find out why keeping to a healthy weight can help you reduce your risk of several health conditions.
Maintain weight loss sustainably
Get tips for a sustainable weight loss plan that can help you achieve the best long-term results.
Food portion size guide
To help take control of your weight, take a look at how much you need of each food group and what that looks like.
Seven tips for a well-balanced diet
From how much protein you need a week to getting enough calcium.
What your BMI result means
A BMI score of over 30 is classed as ‘obese’.
This BMI category is associated with a higher risk of health conditions, such as heart disease, high blood pressure, cancer and type 2 diabetes.
If you want to lose weight, it can be helpful to start with small changes to your eating habits. Choosing fewer high-calorie foods, such as sugary drinks and ultra processed foods like biscuits and crisps, can make a difference over time. Eating lots of fibre and protein can keep you feeling fuller for longer, which may help you manage portions.
Managing stress and sleeping well can also make it easier to eat well. Increasing your physical activity has many benefits and can help to you to use more energy each day.
Weight loss treatment
For those who want help with weight loss and managing their weight
A Bupa GP can advise which weight loss medication is right for you. Plus, you’ll get lifestyle coaching and ongoing support to help track your progress.
What is BMI?
BMI (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 for how tall you are, and if not, how over or underweight you are.
BMI is a useful guide. However, it isn’t always the best measure to use because there are other things that you need to consider when it comes to weight.
Limitations of BMI
BMI readings may not be accurate for everyone. When determining how accurate your BMI score is, it’s important to consider the following.
Other ways to manage your health
We can help you track, manage or address any health concerns you might have.
Calories burned calculator
Work out how many calories you burn while doing a physical activity or exercise.
Health assessments
Our assessments look into your overall health and wellbeing, as well as future risks.
Health subscriptions
Skip the worry and get GP, mental health and physio appointments fast with a 12 month subscription.
Understanding weight management
Read our health information about weight-related health concerns and how to manage them.
Obesity in adults
Find out why being obese increases your risk of serious health conditions.
How to lose weight safely
Advice on how you can lose weight safely and tips on putting your plan into action.
A guide to medicated weight loss
Find out how medicated weight loss works and what the potential side-effects are.
Food portion size guide
To help take control of your weight, take a look at how much you need of each food group and what that looks like.
What is BMI?
BMI (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 for how tall you are, and if not, how over or underweight you are.
BMI is a useful guide. However, it isn’t always the best measure to use because there are other things that you need to consider when it comes to weight.
Limitations of BMI
BMI readings may not be accurate for everyone. When determining how accurate your BMI score is, it’s important to consider the following.
Get a detailed look into your lifestyle
Our health assessments check your overall health and wellbeing and look for future risks. You’ll also get a plan for the future based on your results.
Other ways to manage your health
We can help you track, manage or address any health concerns you might have.
Calories burned calculator
Work out how many calories you burn while doing a physical activity or exercise.
Health subscriptions
Skip the worry and get GP, mental health and physio appointments fast with a 12 month subscription.
Maintaining a healthy weight
Our expert information can help you manage your lifestyle and stay healthy.
Understanding BMI
Find out more about what BMI means and what other measurements you can take.
What is a healthy weight for adults
We explain why keeping to a healthy weight can help you reduce your risk of several health conditions.
Benefits of exercise
Staying active can have positive effects on both your physical and mental health.
Seven tips for a well balanced diet
From how much protein you need a week to getting enough calcium.
Reviewed by Julia Ebbens, Bupa Health Content Editor March 2024
Expert reviewer, Niamh Hennessy, Lead Dietitian, Cromwell Hospital
Next review due March 2027
This information was published by Bupa's Health Content Team and is based on reputable sources of medical evidence. It has been reviewed by appropriate medical or clinical professionals and deemed accurate on the date of review. Photos are only for illustrative purposes and do not reflect every presentation of a condition.
Any information about a treatment or procedure is generic, and does not necessarily describe that treatment or procedure as delivered by Bupa or its associated providers.
The information contained on this page and in any third party websites referred to on this page is not intended nor implied to be a substitute for professional medical advice nor is it intended to be for medical diagnosis or treatment. Third party websites are not owned or controlled by Bupa and any individual may be able to access and post messages on them. Bupa is not responsible for the content or availability of these third party websites. We do not accept advertising on this page.
- Body mass index – BMI. World Health Organization. euro.who.int, accessed 22 April 2024
- Obesity: identification, assessment and management. National Institute for Health & Care Excellence. nice.org.uk, accessed 22 April 2024.
- A healthy balanced diet. British Nutritional Foundation. Nutrition.org.uk, accessed 22 April 2024.
- Bone health checklist. The Royal Osteoporosis Society. theros.org.uk, accessed 22 April 2024
- Underweight and fertility when planning a pregnancy. Tommy’s. www.tommys.org, updated 19 August 2023.
- Healthy snacks: Food Fact Sheet. British Dietetic Association. www.bda.uk.com, updated January 2022
- Help and Treatment. Beat. www.beateatingdisorders.org.uk, accessed 22 April 2024
- Health matters: obesity and the food environment. Public Health England. www.gov.uk, published 31 March 2017
- Macronutrients and energy balance. Oxford Handbook of Nutrition and Dietetics (3 ed). Oxford Medicine Online. www.oxfordmedicine.com, April 2020
- UK Chief Medical Officers' Physical Activity Guidelines. Department of Health and Social Care. www.gov.uk, published 7 September 2019
- Macronutrients and energy balance. Oxford Handbook of Nutrition and Dietetics (3 ed). Oxford Medicine Online. www.oxfordmedicine.com, April 2020
- UK Chief Medical Officers' Physical Activity Guidelines. Department of Health and Social Care. www.gov.uk, published 7 September 2019
- Body Mass Index: Considerations for Practitioners. Centers for Disease Control and Prevention. www.cdc.gov, accessed 24 April 2024
- Weight management before, during and after pregnancy. National Institute for Health & Care Excellence. www.nice.org.uk, accessed 22 April 2024
- Ríos-Prego M, Anibarro L, Sánchez-Sobrino P. Relationship between thyroid dysfunction and body weight: a not so evident paradigm. Int J Gen Med. 2019 Aug;12:299-304. doi: 10.2147/IJGM.S206983.
- Depression signs and symptoms. Mind UK. mind.org.uk, accessed 24 April 2024.
- Poti JM, Braga B, Qin B. Ultra-processed Food Intake and Obesity: What Really Matters for Health-Processing or Nutrient Content? Curr Obes Rep. 2017 Dec;(4):420-431. doi: 10.1007/s13679-017-0285-4.
- Calorie counting. NHS. Nhs.uk, accessed 22 April 2024.
- Fibre. British association of dietitians.bda.uk.com, last reviewed April 2021.
- Razzoli M, Pearson C, Crow S, Bartolomucci A. Stress, overeating, and obesity: Insights from human studies and preclinical models. Neurosci Biobehav Rev. 2017 May;76(Pt A):154-162. doi: 10.1016/j.neubiorev.2017.01.026.
- Kline, C.E., Chasens, E.R., Bizhanova, Z. et al. The association between sleep health and weight change during a 12-month behavioral weight loss intervention. Int J Obes 45, 639–649 (2021). https://doi.org/10.1038/s41366-020-00728-8