BMI Calculator
Work out your Body Mass Index (BMI) from your height and weight, as a general educational guide. No signup. Not medical advice; consult a qualified healthcare professional.
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This BMI calculator works out your Body Mass Index from your height and weight, directly in your browser, as a general educational guide. Enter your height and weight to see the figure. No account, no install, so you can calculate BMI on any device in seconds. This is for general educational purposes only and is not medical advice; for guidance about your health, consult a qualified healthcare professional.
How to Use the BMI Calculator Step by Step
- Enter your height. Enter your height into the calculator, in the units it uses.
- Enter your weight. Enter your weight, so the calculator has both figures needed to work out BMI.
- Calculate your BMI. The tool works out your Body Mass Index from your height and weight, giving the BMI figure.
- See the figure. See your BMI figure, a number derived from your height and weight, as a general reference value.
- Treat it as general information. Treat the figure as general educational information, not a diagnosis or medical advice, and consult a healthcare professional for any health guidance.
What BMI Is and What It Is For
BMI, or Body Mass Index, is a figure calculated from a person's height and weight, widely used as a simple, general reference. It is a single number derived from those two measurements, intended as a rough, general indicator at a population level rather than a precise measure of an individual's health. A BMI calculator works out this figure from the height and weight you enter.
BMI is a general reference, not a measure of health on its own. It is important to understand that BMI is a simple calculation from height and weight, and does not account for the many factors that make up a person's health. It cannot distinguish between different body compositions or consider individual circumstances, so it is a broad general indicator rather than a diagnosis or a complete picture of anyone's health.
This is why BMI has significant limitations and should not be over interpreted. As a single figure from just two measurements, it does not tell you about your actual health, which depends on many factors that BMI does not capture. So a BMI figure is general educational information, not a verdict on your health, and it should not be used to draw conclusions about your health on its own or to make health decisions.
Crucially, a BMI calculator is a general educational tool, not medical advice, and this distinction matters greatly. It provides a general reference figure, but questions about your health, weight, or wellbeing are matters for a qualified healthcare professional, who can consider your individual circumstances properly. If you have any concerns about your health, you should consult a healthcare professional, using the calculator only as general information, never as a substitute for professional advice.
What BMI Does and Does Not Tell You
| Aspect | What BMI is | What BMI is not |
|---|---|---|
| Nature | A general reference figure | A measure of your health |
| Based on | Height and weight only | Your full circumstances |
| Use | General educational information | A diagnosis or medical advice |
| For health guidance | See a professional | Not this calculator |
Who Uses a BMI Calculator
Pro Tips for Understanding BMI
Important Things to Keep in Mind
Related Tools You May Need Next
This BMI calculator is a general educational tool, not medical advice; for any health concerns, consult a qualified healthcare professional. For unit conversions, our Weight Converter and Length Converter may help.
Frequently Asked Questions
How do I use the BMI calculator?
Enter your height and your weight into the calculator, and it works out your Body Mass Index from those two figures, giving you the BMI figure. See the figure, which is a number derived from your height and weight, as a general reference value. Importantly, treat it as general educational information, not a diagnosis or medical advice. This calculator is for general educational purposes only, and BMI is a simple, general reference figure, not a measure of your health. For any questions or concerns about your health, weight, or wellbeing, you should consult a qualified healthcare professional, who can consider your individual circumstances properly.
What is BMI and what is it for?
BMI, or Body Mass Index, is a figure calculated from a person's height and weight, widely used as a simple, general reference. It is a single number derived from those two measurements, intended as a rough, general indicator at a population level rather than a precise measure of an individual's health. So BMI serves as a broad, general reference figure. However, it is important to understand that BMI is just a simple calculation from height and weight, and does not account for the many factors that make up a person's health. So it is general educational information, not a measure of your health or a diagnosis, and should be understood as a general reference only, with any health questions directed to a professional.
Does BMI tell me if I am healthy?
No, BMI does not tell you whether you are healthy. It is a simple figure calculated from only height and weight, and does not account for the many factors that make up a person's health. It cannot distinguish between different body compositions or consider individual circumstances, so it is a broad general indicator rather than a measure of your actual health. Your health depends on many factors that BMI does not capture. So a BMI figure should not be taken as telling you about your health, and you should not draw conclusions about your health from it. For any understanding of your health, weight, or wellbeing, consult a qualified healthcare professional, who can properly consider your individual circumstances, rather than relying on a BMI figure.
Is this BMI calculator medical advice?
No, this BMI calculator is a general educational tool, not medical advice, and this distinction matters greatly. It provides a general reference figure calculated from your height and weight, but questions about your health, weight, or wellbeing are matters for a qualified healthcare professional, who can consider your individual circumstances properly. BMI is a simple, general reference, not a measure of your health or a diagnosis. So you should use the calculator only as general educational information, never as a substitute for professional advice. If you have any concerns about your health, you should consult a qualified healthcare professional. The calculator gives a general figure for educational purposes, but it is not, and should not be treated as, medical advice.
What are the limitations of BMI?
BMI has significant limitations because it is a single figure calculated from just two measurements, height and weight, and does not account for the many factors that make up a person's health. It cannot distinguish between different body compositions or consider individual circumstances, so it does not tell you about your actual health, which depends on many factors BMI does not capture. So BMI is a broad, general indicator, not a precise or complete measure of health, and should not be over interpreted. This is why a BMI figure is general educational information, not a verdict on your health, and should not be used on its own to draw conclusions about your health or make health decisions. For that, a qualified healthcare professional is the appropriate source of guidance.
What should I do if I have concerns about my health?
If you have any concerns about your health, weight, or wellbeing, you should consult a qualified healthcare professional. A BMI calculator is a general educational tool that provides a simple reference figure, but it is not medical advice and does not account for your individual circumstances or the many factors that make up your health. A healthcare professional can properly consider your situation and provide appropriate guidance, which a general figure like BMI cannot. So rather than relying on a BMI figure or drawing conclusions from it, seek advice from a healthcare professional for any health concerns. They are the appropriate source of guidance about your health, weight, and wellbeing, considering your full circumstances, whereas the calculator offers only general educational information.
Should I make health decisions based on my BMI?
No, you should not make health decisions based on your BMI on its own. BMI is a limited, general reference figure calculated from only height and weight, not a health assessment, and it does not account for the many factors that make up your health. So it is not a suitable basis for decisions about your health, diet, or lifestyle. Such decisions should be guided by a qualified healthcare professional, who can consider your individual circumstances properly, rather than by a BMI figure. The calculator provides general educational information only. So for any health decisions or guidance, consult a healthcare professional rather than relying on your BMI, treating the figure as general information and not as something to base health decisions upon by itself.
Is the BMI calculator free?
Yes, it is completely free with no account and no usage limit. You can calculate BMI as often as you like, at no cost. It runs in your browser on any device, so there is nothing to download or install, and the figure appears when you enter your height and weight. Remember that this calculator is for general educational purposes only and is not medical advice. BMI is a simple, general reference figure, not a measure of your health. For any questions or concerns about your health, weight, or wellbeing, consult a qualified healthcare professional, who can consider your individual circumstances, rather than relying on the BMI figure, which is general information only.