Ounces To Kilograms Conversion (oz To Kg) - Inch Calculator

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• Ounces to Kilograms Converter
• How to Convert Ounces to Kilograms
• What Is an Ounce?
• What Is a Kilogram?
• Ounce to Kilogram Conversion Table
• References

Person Icon By Joe Sexton

Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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Sexton, J. (n.d.). Ounces to Kilograms Converter. Inch Calculator. Retrieved January 8, 2026, from https://www.inchcalculator.com/convert/ounce-to-kilogram/

How to Convert Ounces to Kilograms

To convert a measurement in ounces to a measurement in kilograms, multiply the weight by the following conversion ratio: 0.02835 kilograms/ounce.

Since one ounce is equal to 0.02835 kilograms, you can use this simple formula to convert:

kilograms = ounces × 0.02835

The weight in kilograms is equal to the weight in ounces multiplied by 0.02835.

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

kilograms = (5 oz × 0.02835) = 0.141748 kg

Ounces and kilograms are both units used to measure weight. 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 Kilogram?

One kilogram is equal to 1,000 grams, 2.204623 pounds, or 1/1,000 of a metric ton.

The formal definition of the kilogram changed in 2019. One kilogram was previously equal to the mass of the platinum-iridium bar, known as the International Prototype of the Kilogram, which was stored in Sèvres, France.

The 2019 SI brochure now defines the kilogram using the Planck constant, and it is defined using the meter and second.[2] It is equal to the mass of 1,000 cubic centimeters, or milliliters, of water.

The kilogram, or kilogramme, is the SI base unit for weight and is also a multiple of the gram. In the metric system, "kilo" is the prefix for thousands, or 103. Kilograms can be abbreviated as kg; for example, 1 kilogram can be written as 1 kg.

Learn more about kilograms.

Ounce to Kilogram Conversion Table

Table showing various ounce measurements converted to kilograms.

Ounces	Kilograms
1 oz	0.02835 kg
2 oz	0.056699 kg
3 oz	0.085049 kg
4 oz	0.113398 kg
5 oz	0.141748 kg
6 oz	0.170097 kg
7 oz	0.198447 kg
8 oz	0.226796 kg
9 oz	0.255146 kg
10 oz	0.283495 kg
11 oz	0.311845 kg
12 oz	0.340194 kg
13 oz	0.368544 kg
14 oz	0.396893 kg
15 oz	0.425243 kg
16 oz	0.453592 kg
17 oz	0.481942 kg
18 oz	0.510291 kg
19 oz	0.538641 kg
20 oz	0.56699 kg
21 oz	0.59534 kg
22 oz	0.62369 kg
23 oz	0.652039 kg
24 oz	0.680389 kg
25 oz	0.708738 kg
26 oz	0.737088 kg
27 oz	0.765437 kg
28 oz	0.793787 kg
29 oz	0.822136 kg
30 oz	0.850486 kg
31 oz	0.878835 kg
32 oz	0.907185 kg
33 oz	0.935534 kg
34 oz	0.963884 kg
35 oz	0.992233 kg
36 oz	1.0206 kg
37 oz	1.0489 kg
38 oz	1.0773 kg
39 oz	1.1056 kg
40 oz	1.134 kg

References

1. James Bucki, Troy Ounce vs. Ounce, The Spruce, https://www.thesprucecrafts.com/troy-ounce-vs-ounce-4588158
2. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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