What are METs?
A MET (Metabolic Equivalent of Task) is the ratio of the metabolic work rate to the resting metabolic rate. One MET is defined as 1 kcal/kg/hour and is roughly equivalent to the energy cost of sitting quietly. A MET also is defined as oxygen uptake in ml/kg/min with one MET equal to the oxygen cost of sitting quietly, equivalent to 3.5 ml/kg/min.
You can look up the MET for almost any activity on the Compendium of Physical Activities Website.
Calorie Calculation Formula
The calculator on this page uses the following calories burned formula when calculating KCals (kilocalories) burned for the various activities:
For example, if a certain activity has a MET of 8, you weigh 90 kilograms (198.4 pounds), and you perform the activity for 60 minutes, the calories burned would be equal to 756 (8 x 3.5 x 90 ÷ 200 x 60 = 756).
How Many Calories in a Pound?
According to a Mayo Clinic Article: Counting calories: Get back to weight-loss basics, you need to burn about 3,500 calories to lose one pound (0.45 kilogram) of fat. However, the article goes on to say that this may be a conservative figure, ... because when you lose weight, you usually lose a combination of fat, lean tissue and water. Also, because of changes that occur in the body as a result of weight loss.
Calories Burned Walking Calculator
The following calculator will tell you the calories burned walking one hour, and the calories burned walking 1 mile to 8 miles, based on your weight and walking speed.