Calories to Milligrams Conversion (kcal to mg)

Calories to Milligrams Converter

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

Result in Milligrams:

1 kcal = 129.59782 mg

How to Convert Calories to Milligrams

To convert a measurement in calories to a measurement in milligrams, multiply the weight by the following conversion ratio: 129.59782 milligrams/calorie.

Since one calorie is equal to 129.59782 milligrams, you can use this simple formula to convert:

milligrams = calories × 129.59782

The weight in milligrams is equal to the weight in calories multiplied by 129.59782.

For example, here's how to convert 5 calories to milligrams using the formula above.

milligrams = (5 kcal × 129.59782) = 647.9891 mg

How Many Milligrams Are in a Calorie?

There are 129.59782 milligrams in a calorie, which is why we use this value in the formula above.

1 kcal = 129.59782 mg

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

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.

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.

Calorie to Milligram Conversion Table

Table showing various calorie measurements converted to milligrams.
Calories	Milligrams
1 kcal	129.6 mg
2 kcal	259.2 mg
3 kcal	388.79 mg
4 kcal	518.39 mg
5 kcal	647.99 mg
6 kcal	777.59 mg
7 kcal	907.18 mg
8 kcal	1,037 mg
9 kcal	1,166 mg
10 kcal	1,296 mg
11 kcal	1,426 mg
12 kcal	1,555 mg
13 kcal	1,685 mg
14 kcal	1,814 mg
15 kcal	1,944 mg
16 kcal	2,074 mg
17 kcal	2,203 mg
18 kcal	2,333 mg
19 kcal	2,462 mg
20 kcal	2,592 mg
21 kcal	2,722 mg
22 kcal	2,851 mg
23 kcal	2,981 mg
24 kcal	3,110 mg
25 kcal	3,240 mg
26 kcal	3,370 mg
27 kcal	3,499 mg
28 kcal	3,629 mg
29 kcal	3,758 mg
30 kcal	3,888 mg
31 kcal	4,018 mg
32 kcal	4,147 mg
33 kcal	4,277 mg
34 kcal	4,406 mg
35 kcal	4,536 mg
36 kcal	4,666 mg
37 kcal	4,795 mg
38 kcal	4,925 mg
39 kcal	5,054 mg
40 kcal	5,184 mg

Table showing various calorie measurements converted to milligrams.

Calories

Milligrams

1 kcal

129.6 mg

2 kcal

259.2 mg

3 kcal

388.79 mg

4 kcal

518.39 mg

5 kcal

647.99 mg

6 kcal

777.59 mg

7 kcal

907.18 mg

8 kcal

1,037 mg

9 kcal

1,166 mg

10 kcal

1,296 mg

11 kcal

1,426 mg

12 kcal

1,555 mg

13 kcal

1,685 mg

14 kcal

1,814 mg

15 kcal

1,944 mg

16 kcal

2,074 mg

17 kcal

2,203 mg

18 kcal

2,333 mg

19 kcal

2,462 mg

20 kcal

2,592 mg

21 kcal

2,722 mg

22 kcal

2,851 mg

23 kcal

2,981 mg

24 kcal

3,110 mg

25 kcal

3,240 mg

26 kcal

3,370 mg

27 kcal

3,499 mg

28 kcal

3,629 mg

29 kcal

3,758 mg

30 kcal

3,888 mg

31 kcal

4,018 mg

32 kcal

4,147 mg

33 kcal

4,277 mg

34 kcal

4,406 mg

35 kcal

4,536 mg

36 kcal

4,666 mg

37 kcal

4,795 mg

38 kcal

4,925 mg

39 kcal

5,054 mg

40 kcal

5,184 mg

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