BMI, BMR, TDEE Calculator [iPhone]

Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.

BMI or Body Mass Index is a method of estimating a person's body fat levels based on a person's weight and height measurement. While the BMI calculation is an indirect measurement, it has been found to be a fairly reliable indicator of body fat measures in most people.

Your Total Daily Energy Expenditure (TDEE) is an estimation of how many calories you burn per day when exercise is taken into account. It is calculated by first figuring out your Basal Metabolic Rate, then multiplying that value by an activity multiplier.

Each day, your body must breathe, blink, circulate blood, control body temperature, grow new cells, support brain and nerve activity and contract muscles. 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. This number of calories reflects how much energy your body requires to support vital body functions if, hypothetically, you were resting in bed for an entire day. In fact, your BMR is the single largest component (60%) of your total energy burned each day.

This Calorie Calculator is based on the Mifflin-St Jeor Equation.