Team Physics -
Created by: Team Physics -, Last Updated: April 25, 2024


What is Calorie?

A Calorie is a unit of energy commonly used in nutrition to measure the energy content of food and beverages. It represents the amount of heat required to raise the temperature of one gram of water by one degree Celsius.

C = J/4.184​

SI multiples of Calorie

Kilocaloriekcalkilo-1 kcal=1000 cal
MegacalorieMcalmega-1 Mcal=106 cal
GigacalorieGcalgiga-1 Gcal=109 cal
TeracalorieTcaltera-1 Tcal=1012 cal
PetacaloriePcalpeta-1 Pcal=1015 cal
ExacalorieEcalexa-1 Ecal=1018 cal

Conversion of Calorie into other Units

From / ToConversion FactorExample
Calorie to Joules1 calorie = 4.18410 calories = 41.84 joules
Calorie to British Thermal Unit (BTU)1 calorie = 0.0039683210 calories = 0.0396832 BTU
Calorie to kilowatt-hour (kWh)1 calorie = 1.16222e-610 calories = 1.16222e-5 kWh
Calorie to Ergs1 calorie = 418410 calories = 41840 ergs
Calorie to Electronvolts1 calorie =3.82673×10¹⁹10 calories = 3.82673×10²⁰ eV
Calorie to Foot-pounds1 calorie = 3.088025206610 calories = 30.880252066 ft-lb
Calorie to Watt-hours1 calorie = 0.001162222210 calories = 0.0116222222 Wh
Calorie to Us Therm1 calorie = 3.96832072e-910 calories = 3.96832072e-8 US therm
Calorie to Liters of gasoline equivalent1 calorie = 3.10685e-710 calories = 3.10685e-6 Liters of gasoline equivalent
Calorie to Cubic feet of natural gas equivalent1 calorie = 3.96832e-810 calories = 3.96832e-7 Cubic feet of natural gas equivalent
  • The table showcases conversions between calories and various units of energy.
  • Each conversion factor represents a relationship between calories and the respective unit.
  • Examples illustrate how energy quantities in calories translate into other units without specifying specific numerical values.
  • Understanding these conversions aids in expressing energy in different contexts and applications.
  • The table covers a range of units, from joules and BTUs to electronvolts and natural gas equivalents.
  • These conversions are essential in fields such as physics, engineering, nutrition, and energy management.
  • Utilizing conversion tables like this facilitates accurate energy calculations and comparisons across different units.

Calorie to Joules

1 calorie = 4.184 Joules

Converts the energy unit commonly used in nutrition (calorie) to the standard unit of energy in the International System of Units (Joules)

Calorie to British Thermal Unit (BTU)

1 calorie = 0.00396832 British Thermal Unit (BTU)

Transforms the energy unit often employed in dietary contexts (calorie) into British thermal units (BTU), commonly used in engineering and heating systems.

Calorie to kilowatt-hour (kWh)

1 calorie = 1.16222e-6 kilowatt-hour (kWh)

Converts the energy unit typically associated with food (calorie) into kilowatt-hours (kWh), commonly used in electricity billing and consumption.

Calorie to Ergs

1 calorie = 4184 ergs

Converts the energy unit used in nutrition (calorie) to ergs, a unit commonly used in physics, particularly in the study of atomic and molecular processes.

Calorie to Electronvolts

1 calorie =3.82673×10¹⁹ eV

Transforms the energy unit relevant to diet (calorie) into electronvolts (eV), a unit used in particle physics to measure particle energies.

Calorie to Foot-pounds

1 calorie = 3.0880252066 ft-lb

Converts the energy unit familiar in nutrition (calorie) into foot-pounds, a unit commonly used in engineering, particularly in mechanical work and energy calculations.

Calorie to Watt-hours

1 calorie = 0.0011622222 Wh

Transforms the energy unit commonly found in food (calorie) into watt-hours (Wh), a unit used in electricity billing and consumption, particularly in smaller-scale applications.

Calorie to Us Therm

1 calorie = 3.10685e-7 Us Therm

Converts the energy unit associated with nutrition (calorie) into therms, a unit used in natural gas billing and consumption, particularly in residential and commercial heating systems.

Calorie to Liters of gasoline equivalent

1 calorie = 3.10685e-7 Liters of gasoline equivalent

Transforms the energy unit used in nutrition (calorie) into the volume of gasoline equivalent, providing a measure of energy content relative to gasoline.

Calorie to Cubic feet of natural gas equivalent

1 calorie = 3.96832e-8 Cubic feet of natural gas equivalent

Converts the energy unit commonly encountered in food (calorie) into the volume of natural gas equivalent, offering a measure of energy content relative to natural gas.

Calories in Macro Nutrients

  • Carbohydrates: Carbohydrates are one of the main macronutrients and are a primary source of energy for the body. Each gram of carbohydrate provides approximately 4 calories of energy. Common sources of carbohydrates include grains, fruits, vegetables, and legumes.
  • Proteins: Proteins are essential for building and repairing tissues in the body. Like carbohydrates, proteins also provide approximately 4 calories per gram. Sources of protein include meat, poultry, fish, eggs, dairy products, legumes, and nuts.
  • Fats: Fats are another important source of energy and provide the most concentrated form of energy among the macronutrients. Each gram of fat provides approximately 9 calories. Fats also play a role in nutrient absorption, hormone production, and insulation. Common sources of fats include oils, butter, avocados, nuts, seeds, and fatty fish.
  • Alcohol: While not considered a macronutrient, alcohol also provides calories when consumed. Each gram of alcohol provides approximately 7 calories. However, unlike carbohydrates, proteins, and fats, alcohol does not provide essential nutrients and is considered empty calories.

What are the Uses Calories?

Energy Production and Metabolism:

  • Basal Metabolic Rate (BMR): The energy expended at rest to maintain essential physiological functions.
  • Physical Activity: Calories utilized during movement, exercise, and daily activities.

Nutrient Utilization and Storage:

  • Glycogen Storage: Excess calories stored as glycogen in the liver and muscles for future energy needs.
  • Fat Storage: Unused calories stored as adipose tissue (body fat) for long-term energy storage.

Cellular Processes and Maintenance:

  • Protein Synthesis: Calories used to build and repair tissues, enzymes, and hormones.
  • DNA Replication and Cell Division: Energy required for cellular growth, repair, and reproduction.

Thermoregulation and Heat Production:

  • Thermogenesis: Calories contribute to the production of heat, crucial for maintaining body temperature.
  • Cold-induced Thermogenesis: Increased calorie expenditure in response to cold exposure to generate heat.

Brain Function and Cognitive Health:

  • Glucose Metabolism: The brain relies on glucose, derived from calories, as its primary energy source.
  • Cognitive Function: Stable blood glucose levels support optimal cognitive function, memory, and concentration.

Endocrine Regulation and Hormonal Balance:

  • Hormone Production: Calories are essential for the synthesis of hormones that regulate metabolism, growth, and reproduction.
  • Insulin Sensitivity: Balanced calorie intake supports insulin sensitivity, crucial for glucose regulation and metabolic health.


How docalories impact brain function and cognitive health?

Calories are vital for supporting glucose metabolism in the brain, which is its primary energy source. Stable blood glucose levels, derived from balanced calorie intake, are crucial for optimal cognitive function, memory, and concentration.

Can calorie intake affect hormone production and metabolic health?

Yes, calorie intake influences hormone production, including hormones that regulate metabolism, growth, and reproduction. Balanced calorie intake supports insulin sensitivity, which is essential for glucose regulation and overall metabolic health.

Can excess calories be stored differently in the body?

Yes, excess calories can be stored as glycogen in the liver and muscles for short-term energy needs or as body fat (adipose tissue) for long-term energy storage.

AI Generator

Text prompt

Add Tone

10 Examples of Public speaking

20 Examples of Gas lighting