Convert 21 Joules to Calories
How much energy is 21 joules? How many nutritional calories are in 21 joules? 21 J to kcal conversion.
From
To
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21 Joules ≈
0.0050191205 Nutritional Calories
result rounded
Decimal places
Result in Plain English
21 joules is equal to about 5.02 thousandths of a Calorie.
To a Percentage
21 joules ≈ 0.502% of a Calorie.
Result as a Fraction
21 joules
= 21⁄4,184 Calories
In Scientific Notation
21 joules
= 2.1 x 101 joules
≈ 5.01912 x 10-3 Calories
Joules
A joule is the standard unit of energy. On the surface of the Earth, it takes about 9.8 joules to lift a 1 kilogram object by 1 meter.
Calories
A nutritional Calorie, or kilocalorie, is commonly used in food labeling. It is equal to 4.184 kilojoules. The average American consumes about 2,700 kilocalories per day.