Leg extensions are a type of resistance exercise that targets leg muscles known as quadriceps. The number of calories you will burn depends on your weight and how long you do leg extensions.
Formula
The formula for estimating the calories burned while doing leg extensions is (METs x 3.5 x weight in kg) ÷ (200) x amount of time in minutes = calories burned. The American Heart Association reports that metabolic equivalent, or MET, is a number that represent the energy you use while doing leg extensions. Converting your weight to kilograms requires that you divide your weight in pounds by 2.2. A 165-lb. person weighs 75 kg.
MET Value
Exerting light or moderate effort while doing leg extensions at home has a MET value of 3.5, according to the Compendium of Physical Activities Tracking Guide. Weight lifting on an exercise machine that targets certain muscle groups has a MET value of 6.0.
Calories Burned
A 165-lb. person will burn 92 calories while doing leg extensions with light weights for 20 minutes. By exerting a moderate amount of energy, a 165-lb. person can burn 118 calories in 15 minutes.
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