How to convert ounces to kilograms
To convert a measurement in ounces to kilograms, multiply the value by 0.028349523125. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 oz to kilograms: 5 × 0.028349523125 = 0.141747615625 kg.
What is a ounce?
An ounce is an imperial and US customary unit of mass equal to 1/16 of a pound or exactly 28.349523125 grams. The avoirdupois ounce descends from the Roman 'uncia' (one twelfth). It is distinct from the troy ounce used for precious metals, which is heavier at about 31.1 grams.
Common uses of ounces include: Food portions and recipe ingredients in the US; Postal and letter weights; Packaged goods net weight (cereal, snacks); Baby birth weights in the US.
What is a kilogram?
A kilogram is the SI base unit of mass, equal to 1,000 grams or approximately 2.205 pounds. Originally defined in 1795 as the mass of one liter of water, the kilogram was fixed by a platinum-iridium cylinder from 1889 until 2019, when it was redefined in terms of the Planck constant. It is the only SI base unit whose name carries a prefix.
Common uses of kilograms include: Body weight in most countries; Grocery and produce pricing (price per kg); Shipping and freight weight; Scientific and laboratory mass measurements.
Ounces to kilograms worked examples
Here are some common values converted:
1 oz = 0.028349523125 kg 5 oz = 0.141747615625 kg 10 oz = 0.28349523125 kg 50 oz = 1.417476 kg 100 oz = 2.834952 kg
Frequently asked questions
How many kilograms are in one ounce?
One ounce (oz) equals 0.028349523125 kilograms (kg). Multiply any value in ounces by 0.028349523125 to convert to kilograms.
How do I convert ounces to kilograms?
Multiply the value in ounces by 0.028349523125. For example, 5 oz × 0.028349523125 = 0.141747615625 kg.
How do I convert kilograms to ounces?
Multiply the value in kilograms by 35.273962, or divide by 0.028349523125. Use the swap button on the converter above to reverse the direction.
Is the ounce to kilogram conversion exact?
Yes. Since 1959 the international pound is defined as exactly 0.45359237 kg, so all weight conversions between metric and avoirdupois units use exact factors.
What is the formula for ounces to kilograms?
The formula is: kg = oz × 0.028349523125. This comes from the definition of both units relative to the kilogram.