Kilojoule to Watt hour

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Result

0.2778

Wh

Conversion rate: 1 kJ = 0.2778 Wh

Showing up to 4 decimal

How it works

The converter uses exact SI-based factors (e.g., 1 foot = 0.3048 meters, 1 inch = 0.0254 meters).

Formula: watt hours = kilojoule × 0.2778

Results show between 0 and 8 decimal places and hide trailing zeros for readability.

Conversion Table

Kilojoule Watt hour
1 kJ 0.2778 Wh
10 kJ 2.7778 Wh
100 kJ 27.7778 Wh
1000 kJ 277.7778 Wh
1000000 kJ 277777.7778 Wh

History

Kilojoule (kJ)

The kilojoule, symbol kJ, equals 1,000 joules and is used for measuring larger quantities of energy. It was introduced to simplify calculations in nutrition, physics, and engineering, where joules alone would result in very large numbers. Kilojoules are commonly used to express the energy content of foods, fuel consumption, and industrial energy usage. The adoption of the kilojoule has standardized energy measurements across scientific disciplines and commercial applications, offering clarity and ease of use in both everyday and professional contexts.

Watt Hour (Wh)

The watt-hour, symbolized as Wh, represents the energy consumed when one watt of power is used for one hour, equivalent to 3,600 joules. Introduced with the spread of electrical systems in the late 19th century, the watt-hour is a practical unit for measuring smaller-scale electrical consumption, such as that of batteries and small devices. It is widely used in electronics, computing, and renewable energy storage. While large-scale power use is measured in kilowatt hours, watt-hours provide fine-grained detail for portable and household applications.

Other Relevant Conversions

J → kJ J → cal J → kcal J → Wh J → kWh J → eV J → BTU kJ → J kJ → cal kJ → kcal kJ → Wh kJ → kWh kJ → eV kJ → BTU cal → J cal → kJ cal → kcal cal → Wh cal → kWh cal → eV cal → BTU kcal → J kcal → kJ kcal → cal kcal → Wh kcal → kWh kcal → eV kcal → BTU Wh → J Wh → kJ Wh → cal Wh → kcal Wh → kWh Wh → eV Wh → BTU kWh → J kWh → kJ kWh → cal kWh → kcal kWh → Wh kWh → eV kWh → BTU eV → J eV → kJ eV → cal eV → kcal eV → Wh eV → kWh eV → BTU BTU → J BTU → kJ BTU → cal BTU → kcal BTU → Wh BTU → kWh BTU → eV