Calories to Watt-hours Converter

To convert a measurement in calories to watt-hours, multiply the value by 0.001162222222. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 cal to watt-hours: 5 × 0.001162222222 = 0.005811111111 Wh.

A calorie (small calorie) is the energy needed to raise the temperature of one gram of water by one degree Celsius, defined as exactly 4.184 joules. The calorie originated in early-19th-century thermodynamics. The thermochemical calorie, fixed at exactly 4.184 J, is the modern standard, though it is often confused with the larger food Calorie (kilocalorie).

Common uses of calories include: Chemistry and thermodynamics; Heat-of-reaction measurements; Physics heat-transfer problems; Historical energy references.

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.

Here are some common values converted:

1 cal = 0.001162222222 Wh 5 cal = 0.005811111111 Wh 10 cal = 0.011622222222 Wh 50 cal = 0.058111111111 Wh 100 cal = 0.116222222222 Wh