Milligrams to Calories Conversion (mg to kcal)

Milligrams to Calories Converter

Enter the weight in milligrams below to convert it to calories.

Result in Calories:

1 mg = 0.007716 kcal

How to Convert Milligrams to Calories

To convert a measurement in milligrams to a measurement in calories, multiply the weight by the following conversion ratio: 0.007716 calories/milligram.

Since one milligram of body fat is equal to 0.007716 calories, you can use this simple formula to convert:

calories = milligrams × 0.007716

The weight in calories is equal to the weight in milligrams multiplied by 0.007716.

For example, here's how to convert 500 milligrams to calories using the formula above.

calories = (500 mg × 0.007716) = 3.85809 kcal

Milligrams are a unit of weight, and calories are a unit of energy. Keep reading to learn more about each unit of measure.

What Is a Milligram?

The milligram is a unit of mass equal to 1/1,000 of a gram, or 0.0154 grains.

The milligram, or milligramme, is an SI unit of weight in the metric system. In the metric system, "milli" is the prefix for thousandths, or 10^-3. Milligrams can be abbreviated as mg; for example, 1 milligram can be written as 1 mg.

Learn more about milligrams.

What Is a Calorie?

Converting calories is actually a conversion of energy burned by the body performing work rather than actual weight. When measuring the energy content in foods, the large calorie, or kilocalorie, is used, but it's often still just called a "calorie."

One calorie (large calorie) is equal to the heat needed to raise the temperature of one kilogram of water by 1 degree Celsius.^[1] You'll need to burn 3,500 calories more than you eat to lose one pound of weight.^[2]

Calories can be abbreviated as kcal; for example, 1 calorie can be written as 1 kcal.

Learn more about calories.

Milligram to Calorie Conversion Table

Table showing various milligram measurements converted to calories.
Milligrams	Calories
1 mg	0.007716 kcal
2 mg	0.015432 kcal
3 mg	0.023149 kcal
4 mg	0.030865 kcal
5 mg	0.038581 kcal
6 mg	0.046297 kcal
7 mg	0.054013 kcal
8 mg	0.061729 kcal
9 mg	0.069446 kcal
10 mg	0.077162 kcal
20 mg	0.154324 kcal
30 mg	0.231485 kcal
40 mg	0.308647 kcal
50 mg	0.385809 kcal
60 mg	0.462971 kcal
70 mg	0.540133 kcal
80 mg	0.617294 kcal
90 mg	0.694456 kcal
100 mg	0.771618 kcal
200 mg	1.5432 kcal
300 mg	2.3149 kcal
400 mg	3.0865 kcal
500 mg	3.8581 kcal
600 mg	4.6297 kcal
700 mg	5.4013 kcal
800 mg	6.1729 kcal
900 mg	6.9446 kcal
1,000 mg	7.7162 kcal

Table showing various milligram measurements converted to calories.

Milligrams

Calories

1 mg

0.007716 kcal

2 mg

0.015432 kcal

3 mg

0.023149 kcal

4 mg

0.030865 kcal

5 mg

0.038581 kcal

6 mg

0.046297 kcal

7 mg

0.054013 kcal

8 mg

0.061729 kcal

9 mg

0.069446 kcal

10 mg

0.077162 kcal

20 mg

0.154324 kcal

30 mg

0.231485 kcal

40 mg

0.308647 kcal

50 mg

0.385809 kcal

60 mg

0.462971 kcal

70 mg

0.540133 kcal

80 mg

0.617294 kcal

90 mg

0.694456 kcal

100 mg

0.771618 kcal

200 mg

1.5432 kcal

300 mg

2.3149 kcal

400 mg

3.0865 kcal

500 mg

3.8581 kcal

600 mg

4.6297 kcal

700 mg

5.4013 kcal

800 mg

6.1729 kcal

900 mg

6.9446 kcal

1,000 mg

7.7162 kcal

References

Brazier, Yvette, How many calories do you need?, Medical News Today, https://www.medicalnewstoday.com/articles/263028
Guth, E., Healthy Weight Loss, JAMA, 2014, 312(9), 974. https://jamanetwork.com/journals/jama/fullarticle/1900513