Calories to Watt-Seconds Converter

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


Result in Watt-Seconds:

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1 cal = 4.184 Ws

Do you want to convert watt-seconds to calories?

How to Convert Calories to Watt-Seconds

To convert a measurement in calories to a measurement in watt-seconds, multiply the energy by the following conversion ratio: 4.184 watt-seconds/calorie.

Since one calorie is equal to 4.184 watt-seconds, you can use this simple formula to convert:

watt-seconds = calories × 4.184

The energy in watt-seconds is equal to the energy in calories multiplied by 4.184.

For example, here's how to convert 5 calories to watt-seconds using the formula above.
watt-seconds = (5 cal × 4.184) = 20.92 Ws

How Many Watt-Seconds Are in a Calorie?

There are 4.184 watt-seconds in a calorie, which is why we use this value in the formula above.

1 cal = 4.184 Ws

Calories and watt-seconds 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-Second?

The watt-second is a measure of electrical energy equal to one watt of power over a one second period. One watt-second is equal to 1/3,600 of a watt-hour or one joule.

Watt-seconds are usually abbreviated as Ws, although the formally adopted expression is W·s. The abbreviation W s is also sometimes used. For example, 1 watt-second can be written as 1 Ws, 1 W·s, or 1 W s.

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-seconds.

Calorie to Watt-Second Conversion Table

Table showing various calorie measurements converted to watt-seconds.
Calories Watt-seconds
1 cal 4.184 Ws
2 cal 8.368 Ws
3 cal 12.55 Ws
4 cal 16.74 Ws
5 cal 20.92 Ws
6 cal 25.1 Ws
7 cal 29.29 Ws
8 cal 33.47 Ws
9 cal 37.66 Ws
10 cal 41.84 Ws
11 cal 46.02 Ws
12 cal 50.21 Ws
13 cal 54.39 Ws
14 cal 58.58 Ws
15 cal 62.76 Ws
16 cal 66.94 Ws
17 cal 71.13 Ws
18 cal 75.31 Ws
19 cal 79.5 Ws
20 cal 83.68 Ws
21 cal 87.86 Ws
22 cal 92.05 Ws
23 cal 96.23 Ws
24 cal 100.42 Ws
25 cal 104.6 Ws
26 cal 108.78 Ws
27 cal 112.97 Ws
28 cal 117.15 Ws
29 cal 121.34 Ws
30 cal 125.52 Ws
31 cal 129.7 Ws
32 cal 133.89 Ws
33 cal 138.07 Ws
34 cal 142.26 Ws
35 cal 146.44 Ws
36 cal 150.62 Ws
37 cal 154.81 Ws
38 cal 158.99 Ws
39 cal 163.18 Ws
40 cal 167.36 Ws


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

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