Ounces to kilograms
Multiply ounces by 0.0283495 to get kilograms.
20 oz = 0.56699 kg
How to convert ounces to kilograms
The kilogram is the SI base unit of mass, fixed since 2019 by defining the Planck constant as exactly 6.62607015×10⁻³⁴ J·s. The ounce is one sixteenth of an avoirdupois pound, exactly 28.349523125 grams.
Worked example — 20 oz: 20 × 0.0283495 = 0.56699 kg.
Ounces to kilograms table
| Ounces | Kilograms |
|---|---|
| 1 oz | 0.0283495 kg |
| 5 oz | 0.141748 kg |
| 10 oz | 0.283495 kg |
| 16 oz | 0.453592 kg |
| 20 oz | 0.56699 kg |
| 35 oz | 0.992233 kg |
| 50 oz | 1.4175 kg |
| 100 oz | 2.835 kg |
| 160 oz | 4.5359 kg |
Reverse and related
About ounces and kilograms
Ounce (oz)
1 oz = 0.0283495 kgDefinition. One sixteenth of an avoirdupois pound, exactly 28.349523125 grams
History and origin
The ounce comes from the Roman uncia, a twelfth of the libra; the modern avoirdupois ounce is instead one sixteenth of the pound. Through the 1959 agreement it works out to exactly 28.349523125 grams.
Current use
Ounces are used in the United States for food portions, packaged goods and letter mail, and worldwide for boxing weights and some recipes.
Source: NIST Handbook 44, Appendix C §5 (Tables of Equivalents)
Kilogram (kg)
1 kg = 35.274 ozDefinition. The SI base unit of mass, fixed since 2019 by defining the Planck constant as exactly 6.62607015×10⁻³⁴ J·s
History and origin
The kilogram began in 1795 as the mass of one litre of water at the melting point of ice, and from 1889 was embodied in a platinum-iridium cylinder kept near Paris, the International Prototype Kilogram. In 2019 the SI retired that physical artefact and redefined the unit through a fixed value of the Planck constant, leaving its size unchanged.
Current use
It is the base unit of mass almost everywhere on Earth. The main everyday exception is the United States, where people weigh in pounds even though US science, medicine and industry work in kilograms.
Source: BIPM, The International System of Units (SI), 9th ed. (2019)
Where people use this
Ounces: recipe portions, letter mail, packaged food. Kilograms: body weight outside the US, groceries and produce, checked-luggage limits. About 35.3 oz make 1 kg.
Every value is carried to full double precision; the display is rounded.
Sources: BIPM, The International System of Units (SI), 9th ed. (2019); NIST Handbook 44, Appendix C §5 (Tables of Equivalents).
Questions people ask
How many ounces make a kilogram?
About 35.3 ounces make one kilogram. To convert ounces to kg, divide by 35.274.
How many kg is 16 oz?
16 ounces, which is one pound, is about 0.454 kg.
What is 32 oz in kg?
32 ounces is about 0.907 kg.