How to convert kilocalories to watt-hours
To convert a measurement in kilocalories to watt-hours, multiply the value by 1.162222. The conversion factor comes from the relationship between both units and the joule.
For example, to convert 5 kcal to watt-hours: 5 × 1.162222 = 5.811111 Wh.
What is a kilocalorie?
A kilocalorie equals 1,000 small calories, or exactly 4,184 joules, and is the 'Calorie' shown on food nutrition labels. The food Calorie (capital C) is actually a kilocalorie. This convention, established in nutrition science, means a 500-Calorie meal contains 500 kilocalories, or about 2,092 kilojoules.
Common uses of kilocalories include: Food energy (the dietary 'Calorie'); Metabolism and exercise burn estimates; Nutrition and diet planning; Bomb-calorimetry food testing.
What is a watt-hour?
A watt-hour is the energy delivered by one watt of power over one hour, equal to 3,600 joules. The watt-hour emerged with the electrical industry as a practical measure of energy use over time. It underpins the kilowatt-hour that appears on electricity bills worldwide.
Common uses of watt-hours include: Battery capacity ratings; Small electronics energy use; Solar panel and storage sizing; Portable power station specifications.
Kilocalories to watt-hours worked examples
Here are some common values converted:
1 kcal = 1.162222 Wh 5 kcal = 5.811111 Wh 10 kcal = 11.622222 Wh 50 kcal = 58.111111 Wh 100 kcal = 116.222222 Wh
Frequently asked questions
How many watt-hours are in one kilocalorie?
One kilocalorie (kcal) equals 1.162222 watt-hours (Wh). Multiply any value in kilocalories by 1.162222 to convert to watt-hours.
How do I convert kilocalories to watt-hours?
Multiply the value in kilocalories by 1.162222. For example, 5 kcal × 1.162222 = 5.811111 Wh.
How do I convert watt-hours to kilocalories?
Multiply the value in watt-hours by 0.860420650096, or divide by 1.162222. Use the swap button on the converter above to reverse the direction.
Is the kilocalorie to watt-hour conversion exact?
The thermochemical calorie is defined as exactly 4.184 J and the BTU as 1055.056 J. Conversions between SI energy units are exact.
What is the formula for kilocalories to watt-hours?
The formula is: Wh = kcal × 1.162222. This comes from the definition of both units relative to the joule.