Calculate your BMI & BMR

What is Body Mass Index (BMI)?

The body mass index (BMI) is a measure that uses your height and weight to work out if your weight is healthy.

BMI Ranges

For most adults, an ideal BMI is in the 18.5 to 24.9 range.

For children and young people aged 2 to 18, the BMI calculation takes into account age and gender as well as height and weight.

If your BMI is:
  • below 18.5 – you're in the underweight range
  • between 18.5 and 24.9 – you're in the healthy weight range
  • between 25 and 29.9 – you're in the overweight range
  • between 30 and 39.9 – you're in the obese range
  • What is Basal Metabolic Rate (BMR)?

    The amount of energy (in the form of calories) that the body needs to function while resting for 24 hours is known as the basal metabolic rate, or BMR.

    To some extent your BMR is genetically determined but it can also be affected by certain health problems and by physical activity.

    Other factors that influence our BMR include:

  • Age – as we get older our bodies tend to gain fat and lose muscle, so our BMR slows.
  • Body size – bigger adults have a larger BMR.
  • Growth – infants and children have a higher energy demand.
  • Sex – men usually have a faster metabolism than women due to greater their muscle mass.
  • Temperature – extremes of high or low temperatures require burn more fuel.
  • Dieting – during excessive dieting our BMR slows to conserve energy.
  • Drugs – certain drugs, such as caffeine, can increase BMR.
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