Convert Joule to Gigajoule
Please provide values below to convert Joule [J] to Gigajoule [GJ]
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Unit Information
Joule (J)
Definition: The SI unit of energy, work, or heat.
History: Named after English physicist James Prescott Joule.
Current Use: Standard unit for energy in scientific applications.
Kilojoule (kJ)
Definition: A unit of energy equal to 1000 joules.
History: Commonly used for food energy content.
Current Use: Used for nutritional information and larger energy measurements.
Megajoule (MJ)
Definition: A unit of energy equal to one million joules.
History: Used for large energy measurements.
Current Use: Used for vehicle fuel efficiency and large energy systems.
Gigajoule (GJ)
Definition: A unit of energy equal to one billion joules.
History: Used for very large energy measurements.
Current Use: Used for industrial energy consumption and power plants.
Calorie (cal)
Definition: A unit of energy, originally defined as the energy needed to raise 1g of water by 1°C.
History: Defined by French chemist Nicolas Clément.
Current Use: Used in nutrition and food science.
KiloCalorie (kcal)
Definition: A unit of energy equal to 1,000 gram calories, often used to express the energy content of food.
History: Also known as the "large calorie" or "food calorie," it was historically used to measure the energy content of food before the widespread adoption of the joule.
Current Use: The most common unit for expressing the energy value of food and is what people typically refer to when they say "calorie" in a dietary context.
Electron Volt (eV)
Definition: A unit of energy equal to the kinetic energy gained by an electron accelerated through 1 volt.
History: Fundamental unit in atomic and particle physics.
Current Use: Used in atomic, nuclear, and particle physics.
Therm (thm)
Definition: A unit of energy equal to 100,000 BTU.
History: Used in natural gas industry.
Current Use: Standard unit for natural gas billing.
Foot-pound (ft·lb)
Definition: A unit of energy equal to the work done by one pound-force over one foot.
History: Traditional imperial unit.
Current Use: Used in the US for mechanical work and energy.
BTU per hour (BTU/h)
Definition: A unit of power equal to 0.293071 watts, used for measuring heat transfer rates.
History: Derived from the British thermal unit (Btu) and the hour, commonly used in heating and cooling systems.
Current Use: Used in the HVAC industry to express heating and cooling capacities.
British Thermal Unit (BTU)
Definition: A unit of energy equal to about 1055 joules.
History: Traditional British unit for heat energy.
Current Use: Used in heating, ventilation, and air conditioning.
Calorie (15°C) (cal₁₅)
Definition: The amount of heat to raise 1g of water from 14.5°C to 15.5°C.
History: Used in thermochemistry.
Current Use: Rare, but found in older scientific literature.
Calorie (International Table) (cal_IT)
Definition: Defined as exactly 4.1868 joules.
History: Used in international tables for energy conversion.
Current Use: Rare, but found in older scientific literature.
Calorie (Nutritional) (Cal)
Definition: The dietary calorie, equal to 1 kilocalorie.
History: Used in food energy labeling.
Current Use: Standard for food energy in many countries.
Calorie (Thermochemical) (cal_th)
Definition: Defined as exactly 4.184 joules.
History: Used in thermochemistry.
Current Use: Standard in thermochemical calculations.
Erg (erg)
Definition: A unit of energy in the CGS system, equal to 10^-7 joules.
History: From Greek "ergon" meaning work.
Current Use: Used in physics and astronomy for small energies.
Gram Calorie (cal)
Definition: The amount of heat needed to raise 1g of water by 1°C.
History: Used in chemistry and nutrition.
Current Use: Still used in some scientific contexts.
Energy Converter
About this conversion category
The quantitative property that must be transferred to an object in order to perform work.
This converter supports 17 different units including Joule, Kilojoule, Megajoule, Gigajoule, Calorie, KiloCalorie, Electron Volt and Therm. Every unit is backed by definitions, histories, and usage examples so you can justify results in documentation or compliance reports.
Fast facts
- The joule is the SI unit of energy.
- A kilowatt-hour measures electrical energy consumption.
- The calorie used in nutrition is actually a kilocalorie.
Popular conversion formulas
- Convert Joules to Kilocalories:
J / 4184
Looking for step-by-step guidance? Our knowledge base dives into measurement theory, practical applications, and industry examples so you can communicate results with confidence.
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Did you know?
- The joule is the SI unit of energy.
- A kilowatt-hour measures electrical energy consumption.
- The calorie used in nutrition is actually a kilocalorie.
Related Categories
Common Conversions
Convert Joules to Kilocalories
J / 4184