Convert Exajoule to Gigawatt-hour (EJ to Gigawatt-hour)

Exajoule (EJ) and Gigawatt-hour (Gigawatt-hour) are both units of energy. With the conversion form below, you can effortlessly and accurately convert exajoule to gigawatt-hour. This free online calculator tool makes it simple and easy to perform the conversion from EJ unit to the Gigawatt-hour unit.

Energy is the capacity of a physical system to do work or produce heat. The SI unit is the joule (J), defined as the work done when a force of one newton is applied over one meter (1 J = 1 N·m = 1 kg·m²/s²). Other important units include the kilowatt-hour (kWh)—used on electricity bills (1 kWh = 3.6 MJ)—the calorie (cal)—used in nutrition (1 food Calorie = 1 kcal = 4,184 J)—and the electronvolt (eV), used in atomic and particle physics (1 eV = 1.602 × 10⁻¹⁹ J).

An exajoule (symbol: EJ) is an SI-prefixed unit of energy equal to 1,000,000,000,000,000,000 joules (10¹⁸ J). The prefix exa- denotes one quintillion times the base unit. Exajoules are widely used in global energy statistics, climate research, national energy balances, and large-scale industrial analysis to represent extremely large quantities of energy.

One exajoule is equivalent to 1,000 petajoules, 1,000,000 terajoules, or approximately 277.78 terawatt-hours (TWh). Because the annual energy production and consumption of countries are often measured in quintillions of joules, the exajoule provides a practical and standardized way to report these values.

Exajoules are commonly used to describe national energy consumption, global fuel production, renewable energy resources, and long-term energy trends. As an SI-prefixed multiple of the joule, the exajoule provides a consistent and internationally recognized unit for comparing large-scale energy data across countries and industries.

Gigawatt-hour (symbol: GWh) is a unit of energy equal to the energy generated or consumed by one gigawatt of power operating for one hour. One gigawatt-hour is exactly equal to 3.6 terajoules, or 1,000 megawatt-hours. It is commonly used to report the annual electricity production of power plants and the energy consumption of cities and regions. Learn more about gigawatt-hour.