Free tool
BMI calculator
Enter your height and weight to see your body mass index, with the adult weight range it falls in.
Choose your units
Both give the same BMI for the same person. Conversions: 1 inch = 2.54 cm, and 1 pound = 0.4536 kg.
For adults aged 18 and over who are not pregnant. This calculator may not be suitable if you have an eating disorder or a condition that affects your height.
Enter your height and weight to see your result.
BMI does not measure body fat directly. People with high muscle mass may have a BMI that overestimates excess body fat. BMI is not a target.
BMI is a general screening measure. Health risks can also occur at lower BMI levels in some ethnic groups. NICE uses lower cut-offs for South Asian, Chinese, other Asian, Middle Eastern, Black African and African-Caribbean backgrounds: overweight from 23, and obesity from 27.5. Read the NICE guidance
BMI is a screening measure, not a complete assessment of your health. The category uses the unrounded BMI. For a fuller picture, your waist measurement compared with your height can also help. Ask your GP or practice nurse about it.
Your BMI is calculated in your browser. The measurements you enter are not stored or sent.