In order to give riders an idea of their kJ/Calorie reading, the TrainerRoad workout page gives users the ability to see just how many kJ/Cal they can expect to output/burn on any given workout. 25 × 4.184 kJ = 1.045 kJįor practical reasons, most cyclists approximate this to: 1 kJ to 1 Calorie. This boils down to a 1:1 ratio as you can see below:ġ Calorie × 25% =. The remaining 75-80% of the stored chemical energy (Calories) is lost to the external environment in the form of heat. What that means is, of the 1 Calorie your body plans to burn to produce 4.184 kJ of work, the average human body is only going to be effectively using 20-25% of that Calorie to do so. The typical GME ranges from roughly 20% to 25%. The body’s efficiency of turning fuel combustion into work is called an individual’s Gross Metabolic Efficiency (GME). Now, knowing the difference between Calories and calories, one can assume that we’ll need to express joules in a form that converts to the Calorie.ġ calorie = 4.184 joules → 1 Calorie = 4.184 kJs How does One Calorie Equal One Kilojoule?Įven though we just showed that 1 Calorie is 4.184 kJs, the body is not 100% efficient at using that Calorie. That chemical energy transfers into heat and mechanical energy for work in the body.ġ calorie (the small calorie) = 4.184 joules We consume food as a source of energy and the Calorie is simply a measure of stored chemical energy from the food we ingest. The dietary Calorie is what you’re used to seeing.The small calorie is most often used in chemistry, as it represents the approximate amount of energy required to increase the temperature of one gram of water by one degree celsius.Simply put, a calorie is a unit of that energy and is most commonly thought of in two ways: the small calorie (often referred to as the gram/physics calorie) and the large Calorie (known as the dietary calorie, often indicated by a capital “C”). What is a Calorie?įirst thing’s first - what is a calorie? In order to perform while cycling, we need energy. Let’s cover a few of the different terms we have for that energy. Energy in cycling refers to a couple things: the energy that is stored in the form of chemical energy from nutrition, and the heat and mechanical energy that’s doled out when we’re on the bike. In the context of cycling, energy, how it’s consumed, burned and expended is at the center of endurance performance. For practical reasons, most cyclists approximate 1 kJ is equal to 1 Calorie. That means for every Calorie you burn produces around 1.045 kilojoules. Calories burned cycling are dependent on your Gross Metabolic Efficiency, but for most people, it’s between 20-25%. Answer: Divide the amount of kJs by 4.184 then divide by.
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