Watt-Hours to Calories Converter

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


Result in Calories:

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1 Wh = 860.42065 cal

Do you want to convert calories to watt-hours?

How to Convert Watt-Hours to Calories

To convert a measurement in watt-hours to a measurement in calories, multiply the energy by the following conversion ratio: 860.42065 calories/watt-hour.

Since one watt-hour is equal to 860.42065 calories, you can use this simple formula to convert:

calories = watt-hours × 860.42065

The energy in calories is equal to the energy in watt-hours multiplied by 860.42065.

For example, here's how to convert 5 watt-hours to calories using the formula above.
calories = (5 Wh × 860.42065) = 4,302.10325 cal

How Many Calories Are in a Watt-Hour?

There are 860.42065 calories in a watt-hour, which is why we use this value in the formula above.

1 Wh = 860.42065 cal

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

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.

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.

Watt-Hour to Calorie Conversion Table

Table showing various watt-hour measurements converted to calories.
Watt-hours Calories
1 Wh 860.42 cal
2 Wh 1,721 cal
3 Wh 2,581 cal
4 Wh 3,442 cal
5 Wh 4,302 cal
6 Wh 5,163 cal
7 Wh 6,023 cal
8 Wh 6,883 cal
9 Wh 7,744 cal
10 Wh 8,604 cal
11 Wh 9,465 cal
12 Wh 10,325 cal
13 Wh 11,185 cal
14 Wh 12,046 cal
15 Wh 12,906 cal
16 Wh 13,767 cal
17 Wh 14,627 cal
18 Wh 15,488 cal
19 Wh 16,348 cal
20 Wh 17,208 cal
21 Wh 18,069 cal
22 Wh 18,929 cal
23 Wh 19,790 cal
24 Wh 20,650 cal
25 Wh 21,511 cal
26 Wh 22,371 cal
27 Wh 23,231 cal
28 Wh 24,092 cal
29 Wh 24,952 cal
30 Wh 25,813 cal
31 Wh 26,673 cal
32 Wh 27,533 cal
33 Wh 28,394 cal
34 Wh 29,254 cal
35 Wh 30,115 cal
36 Wh 30,975 cal
37 Wh 31,836 cal
38 Wh 32,696 cal
39 Wh 33,556 cal
40 Wh 34,417 cal


  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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