BMI Scales (Body Mass Index) is an index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. Some of our body analyser scales calculate your BMI value for you. The BMI categories shown in the chart and table below are recognised by the WHO (World Health Organisation) and can be used to interpret your BMI value. Your BMI category can be identified using the table on the right. For more information on Salter Analyser Bathroom Scales please read our Body Analyser Guide