21 ounces in kilograms

Conversion

21 ounces is equivalent to 0.595339985625 kilograms.^[1]

Conversion formula
How to convert 21 ounces to kilograms?

We know (by definition) that: $1 oz \approx 0.028349523 kg$

We can set up a proportion to solve for the number of kilograms.

\frac{1 oz}{21 oz} \approx \frac{0.028349523 kg}{x kg}

Now, we cross multiply to solve for our unknown $x$ :

x kg \approx \frac{21 oz}{1 oz} * 0.028349523 kg \to x kg \approx 0.595339983 kg

Conclusion: $21 oz \approx 0.595339983 kg$

21 ounces is equivalent to 0.595339985625 kilograms

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilogram is equal to 1.67971247378954 times 21 ounces.

It can also be expressed as: 21 ounces is equal to $\frac{1}{1.67971247378954}$ kilograms.

Approximation

An approximate numerical result would be: twenty-one ounces is about zero point six zero kilograms, or alternatively, a kilogram is about one point six eight times twenty-one ounces.

Units involved

This is how the units in this conversion are defined:

Ounces

The ounce (abbreviated oz) is a unit of mass used in most British derived customary systems of measurement. It is most pervasive in the retail sale of groceries in the United States, but is also used in many other matters of domestic and international trade between imperial or customary measurement driven countries. Similar customary uses include recipes in cookbooks and sales of bulk dry goods. Whilst various definitions have been used throughout history, two remain in common use, the avoirdupois ounce equal to approximately 28.3 grams and the troy ounce of about 31.1 grams. The avoirdupois ounce is widely used as part of the United States customary and British imperial systems, but the troy ounce is now only commonly used for the mass of precious metals such as gold, silver, platinum, palladium, rhodium, etc..

Wikipedia page of ounces

Kilograms

The kilogram is the base unit of mass in the International System of Units (the Metric system) and is defined as being equal to the mass of the International Prototype of the Kilogram. The avoirdupois (or international) pound, used in both the imperial and US customary systems, is defined as exactly 0.45359237 kg, making one kilogram approximately equal to 2.2046 avoirdupois pounds. Other traditional units of weight and mass around the world are also defined in terms of the kilogram, making the IPK the primary standard for virtually all units of mass on Earth.

Wikipedia page of kilograms

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.

Conversion

Conversion formula How to convert 21 ounces to kilograms?

Conversion in the opposite direction

Approximation

Conversion formula
How to convert 21 ounces to kilograms?