Megacalories to Watt-seconds Conversion

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

Results in Watt-seconds:
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1 Mcal = 4,184,000 Ws

How to Convert Megacalories to Watt-seconds

To convert a megacalorie measurement to a watt-second measurement, multiply the energy by the conversion ratio.

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

watt-seconds = megacalories × 4,184,000

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

For example, here's how to convert 5 megacalories to watt-seconds using the formula above.
5 Mcal = (5 × 4,184,000) = 20,920,000 Ws

How Many Watt-seconds Are in a Megacalorie?

There are 4,184,000 watt-seconds in a megacalorie, which is why we use this value in the formula above.

1 Mcal = 4,184,000 Ws

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


One megacalorie is equal to 1,000,000 calories, which are 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.


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]

Megacalorie to Watt-second Conversion Table

Megacalorie measurements converted to watt-seconds
Megacalories Watt-seconds
0.000001 Mcal 4.184 Ws
0.000002 Mcal 8.368 Ws
0.000003 Mcal 12.55 Ws
0.000004 Mcal 16.74 Ws
0.000005 Mcal 20.92 Ws
0.000006 Mcal 25.1 Ws
0.000007 Mcal 29.29 Ws
0.000008 Mcal 33.47 Ws
0.000009 Mcal 37.66 Ws
0.0000001 Mcal 0.4184 Ws
0.000001 Mcal 4.184 Ws
0.00001 Mcal 41.84 Ws
0.0001 Mcal 418.4 Ws
0.001 Mcal 4,184 Ws
0.01 Mcal 41,840 Ws
0.1 Mcal 418,400 Ws
1 Mcal 4,184,000 Ws


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

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