Activity Level


BMI, BMR & TDEE Calculator

Please complete the form to calculate your BMI, BMR and your TDEE. If you would like to know more about each of these abbreviations scroll down for an explanation on each.

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What is BMI?

BMI (Body Mass Index) is a measurement of body fat based on height and weight that applies to both men and women between the ages of 18 and 65 years.

BMI can be used to indicate if you are overweight, obese, underweight or normal. A healthy BMI score is between 18.5 and 24.9. A score below 18.5 indicates that you may be underweight; a value above 24.9 indicates that you may be overweight.

What is BMR?

BMR (Basal Metabolic Rate) is the amount of energy expended on a daily basis by humans while at rest.

This site uses the Mifflin-St. Jeor equation to estimate your BMR. The Mifflin-St. Jeor formula is seen as a more accurate way to estimate your BMR than the more commonly know Harris Benedict Equation.

Mifflin-St. Jeor Equation

  • Women: BMR = 655 + ( 4.35 x weight in pounds ) + ( 4.7 x height in inches ) - ( 4.7 x age in years )
  • Men: BMR = 66 + ( 6.23 x weight in pounds ) + ( 12.7 x height in inches ) - ( 6.8 x age in years )

What is TDEE?

TDEE (Total Daily Energy Expenditure) is a method used alongside the BMR to calculate the amount of calories your body needs to function in a day based on your activity levels. These levels are grouped as follows:

  • Sedentary (Little or No Exercise)
  • Light Activity (Light Exercise 1-3 Days/Week)
  • Moderately Active (Moderate Exercise 3-5 Days/Week)
  • High Activity (Hard Exercise 6-7 Days/Week)
  • Extreme Activity (Very Hard Exercise 6-7 Days/Week & Highly Physical Job)


The information provided on this website is for your information only and should only be used as a guide. It should not be used or substituted for professional medical advice. It does not take all possible factors into account when performing an assessment of your healthy weight.

Please do not use any of the information provided to make significant changes in your diet, exercise regimen, or any other aspects of your lifestyle without consulting your personal physician first. Please contact your physician if you have any questions or concerns.