BMI/BMR/TDEE Calculator + Weight Loss Projections

Daily Caloric Intake:
Amount of exercise:
Female Male
New BMI:
DateWeightBMI"New" BMI
The Numbers

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. The formula is as follows:

  • BMI = (weight in kg)/(height in m)^2

What is new BMI?

Experts have identified a flaw in the basic BMI formula and have recently come up with a new calculation which presents a more realistic result as it scales more accurately in relation to one's height.

  • BMI = 1.3 x (weight in kg)/(height in m)^2.5

BMI categories

  • Underweight = under 18.5
  • Normal weight = 18.5-24.9
  • Overweight = 25.0-29.9
  • Obesity = 30 or greater

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. Read more about the different methods for calculating BMR here.

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 and Highly Physical Job)

How are the weight projections calculated?

Each week, depending on your planned caloric intake and your activity level, you can lose, gain, or maintain your weight. If your TDEE is greater than your daily intake, you will lose weight. If you consume more than you expend, you'll gain it. Your BMR changes as you lose or gain weight, so I account for this and recalculate it each week based on the weight for that week. The table shows your expected weight for 25 weeks.