Definition of Calorie and Kilogram

What is the definition of a calorie?

A calorie is defined as the heat or energy needed to raise the temperature of 1 gram of water by 1 degree centigrade at a pressure of 1 atmosphere. It is also referred to as gram calorie (g-cal) or thermo chemical calorie or 'small' calorie. This is equal to 4.1868 joules of energy.

The Food Calorie (Calorie with capital C) or kcal is equal to 1000 calories and is defined as the amount of heat needed to raise the temperature of 1 kilogram of water by 1 degree centigrade. The energy required for this in terms of joules is 4186.8

The Food Calorie is the one mentioned in all edible products and it indicates the amount of energy (in kilo calories) that it contains.

What is the definition of a Kilogram?

A kilogram is the standard SI unit of mass and it is the mass nearly equal to 1000 cubic cm of water and equal to 1000 grams. The latest definition of Kilogram is based on Planck's constant 6.626070150 × 10-34 kg m2/s. This is derived from the relationships between Energy, Mass and Frequency

There is no direct correlation between Calorie and Kilogram. They are indirectly related through Energy measured in Joules or kg m2/s2

How to Convert Calories to Kilograms

To convert Calories to kg, multiply the number of calories by 0.000129. This is for converting Calories to kg of fat

kg = calories * 0.000129

For example, to convert 2000 calories to kg:

2000 calories * 0.000129 = 0.47 kg

How many Kilo is a calorie?

To convert kg of fat to calories, multiply by 7716.179 (divide by 0.000129):

calories = kg * 7716.179

For example, to convert 0.5 kg to calories,

0.5 kg * 7716.179 = 3858 calories

A few key calorie to kg conversion values using the formula above:

100 calories to kg = 0.013 kg

500 calories in kg = 0.065 kg

1000 calories to kg = 0.13 kg

Some Interesting Facts on Calorie to Kg Conversion

faq icon
  • The relationship between Calories and Kilogram is not a direct one and there is no accurate formula or equation for the same. However, it is well established that 1 gram of fat contains 9 calories, a gram of protein and carbohydrate contain 4 calories each. This has been tested under lab conditions. For fat, it is extrapolated to a lower value averaging to 7.716 calories under actual conditions based on absorption and other factors. Therefore, a 1000 grams or 1 kg of fat contains 7716 calories and it is the energy stored as body fat. This is used as the basis for the conversion of calorie to kg.
  • The conversion factor of 0.00013 is derived from the above (1/7716 = 0.00013) To convert calorie to kilogram of fat, multiply by this conversion factor
  • The Calorie to Kg Equation and Impact on Weight Management: Understanding the relationship between calories and kilograms is important for weight management. One kilogram of body weight is roughly equivalent to 7,716 calories. This means that in order to lose one kilogram, you need to create a calorie deficit of 7,716 calories by diet and exercise . In order to gain 1 kg, you need a calorie surplus diet of roughly 7,700 calories
  • Calories to Kilogram and Energy Balance: The concept of calories to kilogram conversion is based on the energy balance equation. This equation states that weight gain occurs when there is an excess of calories consumed compared to calories burned, and weight loss occurs when you burn more calories than what you consume. By understanding this equation, individuals can make informed decisions about their calorie intake and expenditure to achieve their desired weight goals.
  • The Cal-kg Equation and Food: It's important to note that different foods have varying calorie to kilogram conversion rates. For example, one kilogram of fat contains approximately 7,000-8,000 calories, while one kilogram of muscle contains around 2,700-3,500 calories. This highlights the importance of maintaining a healthy body composition and focusing on building lean muscle mass.
  • Calories, Activity and Weight: When engaging in physical activity, it's helpful to understand the calorie to weight relation for different activities and the metabolical equivalent. For instance, running at a moderate pace burns approximately 100 calories per kilometer, while cycling at a moderate pace burns around 40-50 calories per kilometer and swimming burns 150 calories/hour. This knowledge can assist in setting fitness goals and tracking progress and for effective planning.

The relationship between calories and weight in kgs can be used as reference and as a general guideline. Any weight management should be approached holistically with a proper combination of exercise, diet, sleep, stress management and to be done under proper guidance of health professionals

Calories to Kg converter (cal to kg) Table

Conversion Table Icon
Calories (kcal) Kilogram (kg)

1 Calorie

0.00013 kg

2 Calories

0.00026 kg

3 Calories

0.000389 kg

4 Calories

0.00052 kg

5 Calories

0.00065 kg

6 Calories

0.000779 kg

7 Calories

0.000909 kg

8 Calories

0.00104 kg

9 Calories

0.001169 kg

10 Calories

0.0013 kg

20 Calories

0.0026 kg

30 Calories

0.0039 kg

40 Calories

0.0052 kg

50 Calories

0.0065 kg

60 Calories

0.0078 kg

70 Calories

0.00909 kg

80 Calories

0.0104 kg

90 Calories

0.01169 kg

100 Calories

0.013 kg

200 Calories

0.026 kg

250 Calories

0.0324 kg

300 Calories

0.039 kg

400 Calories

0.052 kg

500 Calories

0.0649 kg

600 Calories

0.078 kg

700 Calories

0.091 kg

800 Calories

0.104 kg

900 Calories

0.11699 kg

1000 Calories

0.1299 kg

2000 Calories

0.2599 kg

3000 Calories

0.3899 kg

3500 Calories

0.4549 kg

4000 Calories

0.51999 kg

5000 Calories

0.6499 kg

6000 Calories

0.7799 kg

7000 Calories

0.9099 kg

8000 Calories

1.0399 kg

9000 Calories

1.17 kg

10000 Calories

1.2999 kg

Kg to Calories (kg to cal) Conversion Table

Conversion Table Icon
Kilogram (kg) Calories (kcal)
0.1 kg 771.6179176 Calories
0.25 kg 1929.044794 Calories
0.5 kg 3858.089588 Calories
0.75 kg 5787.134382 Calories
1 kg 7716.179176 Calories
1.25 kg 9645.22397 Calories
1.5 kg 11574.26876 Calories
1.75 kg 13503.31356 Calories
2 kg 15432.35835 Calories
2.2 kg 16975.59419 Calories
2.5 kg 19290.44794 Calories
3 kg 23148.53753 Calories
3.5 kg 27006.62712 Calories
4 kg 30864.7167 Calories
4.5 kg 34722.80629 Calories
5 kg 38580.89588 Calories
5.5 kg 42438.98547 Calories
6 kg 46297.07506 Calories
6.5 kg 50155.16464 Calories
6.6 kg 50926.78256 Calories
7 kg 54013.25423 Calories
7.5 kg 57871.34382 Calories
8 kg 61729.43341 Calories
8.5 kg 65587.523 Calories
9 kg 69445.61258 Calories
9.5 kg 73303.70217 Calories
10 kg 77161.79176 Calories
11.02 kg 85032.29452 Calories

Frequently Asked Questions on Calories to Kg calculator

FAQ icon

  • There are 7716 Calories in a kilogram of fat. Depending on the item, the number of Calories / gram varies. A gram of protein and carbohydrate contains 4 Calories, Fibre 2 Calories, Alcohol 7 Calories, Organic Acid 3 Calories, Water and some Fruits & Vegetables 0 Calories.

  • To convert kilogram of fat to Calorie (kcal), multiply by 7716.18 1 Calorie = kg * 7716.18

  • You can use this as a reference to understand the relationship between weight and calorie and use it for your calculations on weight gain or loss through diet or exercise. However, for any medical or diet planning, always consult and work under the supervision of a professional

  • The conversion factor which is commonly used by all tools to convert Calorie to kg of fat is 0.000129. This value can vary and therefore, the conversion is not precise but only an approximation and also changes with other food types such as protein and carbs. However, it is still valuable and useful for understanding how much calorie surplus or deficit is needed for gaining or losing few kgs.

  • It is only a reference for calorie to kg fat conversion. All online converters apply the same standard formula for conversion between Calorie and kg (1 kg of fat approximately contains 7716 Calories). But in reality, you have to take into account the energy / gram of all the food ingredients and then total them up to get the actual kilogram.