Ounces to Calories Conversion (oz to kcal)

Ounces to Calories Converter

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

Result in Calories:

1 oz = 218.75 kcal

How to Convert Ounces to Calories

To convert a measurement in ounces to a measurement in calories, multiply the weight by the following conversion ratio: 218.75 calories/ounce.

Since one ounce of body fat is equal to 218.75 calories, you can use this simple formula to convert:

calories = ounces × 218.75

The weight in calories is equal to the weight in ounces multiplied by 218.75.

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

calories = (5 oz × 218.75) = 1,093.75 kcal

How Many Calories Are in an Ounce of Body Fat?

There are 218.75 calories in an ounce of body fat, which is why we use this value in the formula above.

1 oz = 218.75 kcal

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

What Is an Ounce?

One ounce is a unit of mass/weight equal to 1/16 of a pound or 28.349523 grams. The common ounce should not be confused with the troy ounce, which is equal to 1/12 of a troy pound.^[1]

The ounce is a US customary and imperial unit of weight. Ounces can be abbreviated as oz; for example, 1 ounce can be written as 1 oz.

Learn more about ounces.

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.^[2] You'll need to burn 3,500 calories more than you eat to lose one pound of weight.^[3]

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

Learn more about calories.

Ounce to Calorie Conversion Table

Table showing various ounce measurements converted to calories.
Ounces	Calories
1 oz	218.75 kcal
2 oz	437.5 kcal
3 oz	656.25 kcal
4 oz	875 kcal
5 oz	1,094 kcal
6 oz	1,313 kcal
7 oz	1,531 kcal
8 oz	1,750 kcal
9 oz	1,969 kcal
10 oz	2,188 kcal
11 oz	2,406 kcal
12 oz	2,625 kcal
13 oz	2,844 kcal
14 oz	3,063 kcal
15 oz	3,281 kcal
16 oz	3,500 kcal
17 oz	3,719 kcal
18 oz	3,938 kcal
19 oz	4,156 kcal
20 oz	4,375 kcal
21 oz	4,594 kcal
22 oz	4,813 kcal
23 oz	5,031 kcal
24 oz	5,250 kcal
25 oz	5,469 kcal
26 oz	5,688 kcal
27 oz	5,906 kcal
28 oz	6,125 kcal
29 oz	6,344 kcal
30 oz	6,563 kcal
31 oz	6,781 kcal
32 oz	7,000 kcal
33 oz	7,219 kcal
34 oz	7,438 kcal
35 oz	7,656 kcal
36 oz	7,875 kcal
37 oz	8,094 kcal
38 oz	8,313 kcal
39 oz	8,531 kcal
40 oz	8,750 kcal

Table showing various ounce measurements converted to calories.

Ounces

Calories

1 oz

218.75 kcal

2 oz

437.5 kcal

3 oz

656.25 kcal

4 oz

875 kcal

5 oz

1,094 kcal

6 oz

1,313 kcal

7 oz

1,531 kcal

8 oz

1,750 kcal

9 oz

1,969 kcal

10 oz

2,188 kcal

11 oz

2,406 kcal

12 oz

2,625 kcal

13 oz

2,844 kcal

14 oz

3,063 kcal

15 oz

3,281 kcal

16 oz

3,500 kcal

17 oz

3,719 kcal

18 oz

3,938 kcal

19 oz

4,156 kcal

20 oz

4,375 kcal

21 oz

4,594 kcal

22 oz

4,813 kcal

23 oz

5,031 kcal

24 oz

5,250 kcal

25 oz

5,469 kcal

26 oz

5,688 kcal

27 oz

5,906 kcal

28 oz

6,125 kcal

29 oz

6,344 kcal

30 oz

6,563 kcal

31 oz

6,781 kcal

32 oz

7,000 kcal

33 oz

7,219 kcal

34 oz

7,438 kcal

35 oz

7,656 kcal

36 oz

7,875 kcal

37 oz

8,094 kcal

38 oz

8,313 kcal

39 oz

8,531 kcal

40 oz

8,750 kcal

References

James Bucki, Troy Ounce vs. Ounce, The Spruce, https://www.thesprucecrafts.com/troy-ounce-vs-ounce-4588158
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