Watt-Seconds to Megacalories Converter

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


Result in Megacalories:

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1 Ws = 2.3901E-7 Mcal
Hint: use a scientific notation calculator to convert E notation to decimal

Do you want to convert megacalories to watt-seconds?

How to Convert Watt-Seconds to Megacalories

To convert a measurement in watt-seconds to a measurement in megacalories, divide the energy by the following conversion ratio: 4,184,000 watt-seconds/megacalorie.

Since one megacalorie is equal to 4,184,000 watt-seconds, you can use this simple formula to convert:

megacalories = watt-seconds ÷ 4,184,000

The energy in megacalories is equal to the energy in watt-seconds divided by 4,184,000.

For example, here's how to convert 5,000,000 watt-seconds to megacalories using the formula above.
megacalories = (5,000,000 Ws ÷ 4,184,000) = 1.195029 Mcal

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

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.

What Is a Megacalorie?

One megacalorie is equal to 1,000,000 calories, which is the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius. One megacalorie is equal to 4.184 megajoules.

Megacalories can be abbreviated as Mcal; for example, 1 megacalorie can be written as 1 Mcal.

Learn more about megacalories.

Watt-Second to Megacalorie Conversion Table

Table showing various watt-second measurements converted to megacalories.
Watt-seconds Megacalories
1 Ws 0.00000023901 Mcal
2 Ws 0.00000047801 Mcal
3 Ws 0.00000071702 Mcal
4 Ws 0.00000095602 Mcal
5 Ws 0.000001195 Mcal
6 Ws 0.000001434 Mcal
7 Ws 0.000001673 Mcal
8 Ws 0.000001912 Mcal
9 Ws 0.0000021511 Mcal
10 Ws 0.0000023901 Mcal
100 Ws 0.000023901 Mcal
1,000 Ws 0.000239 Mcal
10,000 Ws 0.00239 Mcal
100,000 Ws 0.023901 Mcal
1,000,000 Ws 0.239006 Mcal
10,000,000 Ws 2.3901 Mcal


  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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