# Question: How To Calculate Energy Content In Kj G?

## How do you calculate energy content per gram?

where H = heat energy absorbed (in J), ∆t = change in temperature (in °C), m = mass (in g), and Cp = specific heat capacity (4.18 J/g°C for water). Dividing the resulting energy value by grams of food burned gives the energy content (in J/g).

## How do you calculate energy content?

The equation for calculating the energy content of a food source via calorimetry is as follows: Energy (joules) = Mass of water (g) × 4.2 (J/gºC) × Temperature increase (ºC)

## How do you calculate kcal g from energy?

If your are speaking about nutritional energy (calories ) obtained from food, The formula is Energy (in Kcal) = 4x (Proteins and carbohydrates mass in grams) + 9 x mass of fat in grams.

## How do you calculate the energy content of fuel?

where H = heat energy absorbed (in J), ∆t = change in temperature (in °C), m = mass (in g), and Cp = specific heat capacity (4.18 J/g°C for water). Dividing the resulting energy value by grams of food burned gives the energy content (in J/g).

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## How much energy is a Kilojoule?

A kilojoule is a unit of measure of energy, in the same way that kilometres measure distance. Food energy used to be measured in Calories (Cal) and some countries still use those units. The conversions are as follows: 1 kJ = 0.2 Cal.

## What type of energy is food?

We get chemical energy from foods, which we use to run about, and move and talk (kinetic and sound energy). Chemical energies are stored in fuels which we burn to release thermal energy – this is one way of making electricity, see Electricity for more information.

## What are the main sources of energy for your body?

Carbohydrates are the body’s main source of energy. The fruit, vegetables, dairy, and grain food groups all contain carbohydrates. Sweeteners like sugar, honey, and syrup and foods with added sugars like candy, soft drinks, and cookies also contain carbohydrates.

## How do you convert kilojoules to calories?

Note that 1 kJ = 0.239 calories. So, to convert from joules to calories, all you have to do is multiply by 0.239. For example, multiply 5,000 J by 0.239 to get 1,195 cal. Therefore, 5 kJ = 1,195 calories.

## What is J in energy?

The joule (symbol J) is the SI unit of energy—a measure of the capacity to do work or generate heat. One joule equals the work done (or energy expended) by a force of one newton (N) acting over a distance of one meter (m).

## How do you convert kcal to energy?

One calorie (kcal) equals 4.18 kJ or 4,184 joules (J) ( 1 ). To convert from calories to kJ, multiple calories by 4.18. Conversely, to convert from kJ to calories, divide kJ by 4.18. For example, a medium-sized banana (118 grams) provides 105 calories (kcal) or 439 kJ ( 2 ).

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## How many kcal do we need per day?

As a guide, an average man needs around 2,500kcal (10,500kJ) a day to maintain a healthy body weight. For an average woman, that figure is around 2,000kcal (8,400kJ) a day. These values can vary depending on age, size and levels of physical activity, among other factors.

## How do you calculate kcal per day?

To determine your total daily calorie needs, multiply your BMR by the appropriate activity factor, as follows:

1. If you are sedentary (little or no exercise): Calorie-Calculation = BMR x 1.2.
2. If you are lightly active (light exercise/sports 1-3 days/week): Calorie-Calculation = BMR x 1.375.

## How do you calculate Atwater factor?

The Atwater factor for fat is 8.5, so if we are to multiply the 150g (because 15% of 1000g is 150g) 150g x 8.5 = 1,275 kcal/kg of this food.