Your BMI against the NHS categories, the healthy weight range for your height, and how far you are from it — in kg, stone or pounds.
Body Mass Index
Enter your weight and height, then press Calculate my BMI.
BMI tells you where you are starting from. If you are already on a GLP-1 medication, the dose checker looks at how the last few weeks have actually gone — weight change, side effects and appetite control — so you know what to ask at your next review.
Check how your dose is workingBMI is a screening measure, not a diagnosis. It compares weight against height and nothing else, so it cannot tell muscle from fat and does not account for body composition or where weight is carried. The adult categories do not apply to children, to pregnancy, or to people over about 65, and people of South Asian, Chinese, Black African and African-Caribbean backgrounds face increased health risks at a lower BMI. Decisions about your health, including whether any treatment is right for you, belong with your GP or pharmacist.
Built by the CoolDose teamLast updated
BMI categories. The NHS bands for underweight, healthy weight, overweight and obese. nhs.uk
The lower thresholds. NICE guideline NG246 on overweight and obesity management, which sets lower action points for some family backgrounds. nice.org.uk
Why the bands differ by ethnicity. The NHS advises that people of South Asian, Chinese, Black African and African-Caribbean backgrounds face increased health risks at a lower BMI, and suggests acting from 23 rather than 25. nhs.uk
What BMI cannot tell you. It compares weight against height and nothing else, so it cannot separate muscle from fat and says nothing about where weight is carried. It is a screening measure, not a diagnosis.
Body Mass Index is your weight in kilograms divided by your height in metres squared. It is a quick way to see whether your weight sits in a healthy range for your height.
The NHS bands: under 18.5 is underweight, 18.5 to 24.9 is a healthy weight, 25 to 29.9 is overweight, 30 to 39.9 is obese, and 40 or above is severely obese.
It measures weight against height and nothing else. It cannot tell muscle from fat, so a very muscular person can read as overweight while carrying little fat. It also does not account for where fat is carried, which matters for health.
The adult bands do not apply to children, pregnant women, or people over about 65. People of South Asian, Chinese, Black African and African-Caribbean backgrounds face a higher risk at a lower BMI, so the NHS suggests acting from 23 rather than 25.
Treat it as a starting point rather than a diagnosis. If it sits outside the healthy range, your GP or pharmacist can look at it alongside your waist measurement, blood pressure and medical history.