Calories to Watt-Hours Converter

Enter the energy in calories below to get the value converted to watt-hours.


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Result in Watt-Hours:

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1 cal = 0.001162 Wh

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How to Convert Calories to Watt-Hours

To convert a measurement in calories to a measurement in watt-hours, multiply the energy by the following conversion ratio: 0.001162 watt-hours/calorie.

Since one calorie is equal to 0.001162 watt-hours, you can use this simple formula to convert:

watt-hours = calories × 0.001162

The energy in watt-hours is equal to the energy in calories multiplied by 0.001162.

For example, here's how to convert 500 calories to watt-hours using the formula above.
watt-hours = (500 cal × 0.001162) = 0.581111 Wh

Calories and watt-hours are both units used to measure energy. Keep reading to learn more about each unit of measure.

What Is a Calorie?

One calorie is equal to the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius.

When measuring the energy content in foods, the large calorie, or kilocalorie is used, but it's often still just called a "calorie." When both the calorie and large calorie are used in the same context it is common to refer to the calorie as a "small calorie."

Calories can be abbreviated as cal; for example, 1 calorie can be written as 1 cal.

Learn more about calories.

What Is a Watt-Hour?

The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours are usually abbreviated as Wh, although the formally adopted expression is W·h. The abbreviation W h is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.[1]

Learn more about watt-hours.

Calorie to Watt-Hour Conversion Table

Table showing various calorie measurements converted to watt-hours.
Calories Watt-hours
1 cal 0.001162 Wh
2 cal 0.002324 Wh
3 cal 0.003487 Wh
4 cal 0.004649 Wh
5 cal 0.005811 Wh
6 cal 0.006973 Wh
7 cal 0.008136 Wh
8 cal 0.009298 Wh
9 cal 0.01046 Wh
10 cal 0.011622 Wh
20 cal 0.023244 Wh
30 cal 0.034867 Wh
40 cal 0.046489 Wh
50 cal 0.058111 Wh
60 cal 0.069733 Wh
70 cal 0.081356 Wh
80 cal 0.092978 Wh
90 cal 0.1046 Wh
100 cal 0.116222 Wh
200 cal 0.232444 Wh
300 cal 0.348667 Wh
400 cal 0.464889 Wh
500 cal 0.581111 Wh
600 cal 0.697333 Wh
700 cal 0.813556 Wh
800 cal 0.929778 Wh
900 cal 1.046 Wh
1,000 cal 1.1622 Wh


  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019,

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