Ounces to Kilograms (oz to kg) Conversion Online

1 ounce is equal to 1.00 kilogram

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In everyday life, we often face the need to convert measurements from one unit to another. Ounces (oz) and kilograms (kg) are two commonly used units of measurement for weight or mass. Ounces are mostly used in the United States and a few other countries. Kilograms, on the other side, are used as the primary unit of weight measurement in most countries around the globe.

Converting between oz to kg may be unavoidable in several daily and practical situations. The need arises while you’re cooking or shopping for groceries. Fortunately, many online tools can help you convert ounce to kg and vice versa.

What is an Ounce?

In scientific terms, the weight of an object is nearly 10 times its mass. Though there are several units to measure weight, the ounce has earned credence as one of the most widely used units of measurement, particularly in the United States.

The different Ounce varieties, such as the avoirdupois ounce, troy ounce, and fluid ounce, find specific applications in the vast domain of weights and measurement.

  • Current Use of Ounce

The ounce is one of the smallest units of weight measurement. It is widely used in the United States and the United Kingdom to measure the weights of innumerable items. Some shopkeepers sell their products in Ounces rather than in Pounds or Kilograms. So, understanding how to convert ounces to kilograms or pounds can save you pennies.

Furthermore, the price of precious metals, such as gold and silver, is often quoted in troy ounces. A troy ounce weighs approximately 31 grams. You may also use ounces to measure recipe ingredients, especially in the United States.

For instance, a recipe might call for 8 ounces of flour or 4 ounces of cheese. Also, fluid ounces measure the volume of liquids, such as soft drinks or alcoholic beverages. Next time you buy a can of soda, check out. It might probably contain 12 fluid ounces!

  • History of Ounce

The history of ounces dates back to ancient Rome, where it was used as a unit of weight. In the 14th century, the troy ounce was developed as a unit of weight for precious metals. It was named after the city of Troyes in France, where the first standardized system for measuring precious metals was developed. Meanwhile, the avoirdupois ounce was developed in the 16th century for everyday items like food and clothing. It was slightly larger than the troy ounce, weighing approximately 28.35 grams.

Fast forward to today, the valley of uncertainty has dwindled, and accurate measurements can be easily obtained. The troy ounce and the avoirdupois ounce are still commonly used for measuring weight in different contexts. There are also other types of ounces, such as the fluid ounce used for measuring the volume of liquids. In a nutshell, the ounce has had a long and exciting history as a unit of weight, and its use is likely to carry the legacy forward.

What is a Kilogram?

In the International System of Units, a kilogram (kg) serves as the fundamental unit of mass (SI). It is commonly used to calculate the weight or mass of various items, including people, animals, and products.

The mass of chemicals, materials, and other things are measured by employing kilogram for scientific research and also in various industries. The kilogram is frequently shortened to “kg” in daily language and is used in grocery stores and other retail settings. 

  • Current Use Of Kilogram

The kilogram is a common measure of mass used around the world for measuring ordinary items and products as well as in scientific study and business. It is used as the industry standard for gauging body weight in Asia. The weight of commonplace products like food, clothing, and other home items is also measured in kilograms.

Kilogram also finds several industrial applications, such as manufacturing processes requiring accurate mass measurements. It also plays a pivotal role in scientific research, measuring the mass of particles, chemicals, and other materials. It also serves as a standard unit for goods and products in international trade and commerce. Furthermore, the kilogram is used in medical applications, such as determining medication dosage based on a patient’s weight.

  • History of Kilogram

The French Academy of Sciences advocated the creation of a global standard for measuring mass in the late 18th century, which is when the kilogram’s history began. Antoine Lavoisier and Jean-Baptiste Le Roy, two French physicists, and chemists, created the first-kilogram prototype in 1795. The prototype was improved in 1799 by French engineer and physicist Joseph-Louis Lagrange.

The International Prototype of the Kilogram, or IPK, is a platinum-iridium cylinder. Yet as time went on, it was found that the prototype’s mass was very slightly shifting, raising questions about the measurement’s precision. To solve this, the kilogram’s definition was modified in 2018 to be based on a basic natural constant named Planck’s Constant. 

Relationship Between Ounce and Kilogram

An ounce and a kilogram are both units of mass or weight, but they belong to different measurement systems. An ounce is a unit of mass in the Imperial system of measurement, which is used in the United States and a few other countries. At the same time, a kilogram is the base unit of mass in the International System of Units (SI), which is used in most parts of the world.

One ounce is approximately equal to 0.02835 kilograms, while one kilogram is equal to approximately 35.273 ounces. In other words, one kilogram is much larger than one ounce, so it takes more ounces to equal a kilogram.

How to Convert Ounce to Kilogram

To convert ounces to kg, let’s first understand how to convert 1 oz to kg.

1 ounce (oz) = 0.02835 kilograms (kg)
So to convert oz to kg, multiply the number of ounces by 0.02835. Here’s the formula:
Number of ounces x 0.02835 = Number of kilograms

For example, let’s say you have a package that weighs 50 ounces, and you want to know its weight in kilograms. You can use the formula as follows to convert ounce to kg

50 ounces = 50 x 0.02835 = 1.41748 kilograms.

Therefore, the weight of the package is 1.41748 kilograms.

Alternatively, you can use an online converter or a calculator to convert ounces to kilograms quickly and easily. Just enter the number of ounces you want to convert, and the converter will do the math for you.

Formula and Examples on Ounce to Kilogram Conversion

The formula for converting ounces (oz) to kilograms (kg) is:

kilograms = ounces x 0.02835

Here are some examples of how to convert ounce to kg using this formula:

Example 1: Convert 5 ounces to kg
kilograms = 5 oz x 0.02835 = 0.141748 kg

Example 2: Convert 20 ounces to kilograms
kilograms = 20 oz x 0.02835 = 0.56699 kg

Example 3: Convert 40 ounces to kg
kilograms = 40 oz x 0.02835 = 1.13398 kg

Therefore, the oz to kg conversion of 40 ounces equals 1.13398 kilograms.

Ounce to Kilogram Conversion Table 

Ounces (oz)

Kilogram (kg)

  1 oz

0.0283495 kg

  2 oz

0.056699 kg

 3 oz

0.0850485 kg

4 oz

0.113398 kg

5 oz

0.1417475 kg

6 oz

0.170097 kg

7 oz

0.1984465 kg

8 oz

0.226796 kg

9 oz

0.2551455 kg

10 oz

0.283495 kg

 11 oz

0.3118445 kg

12 oz

0.340194 kg

13 oz

0.3685435 kg

14 oz

0.396893 kg

15 oz

0.4252425 kg

16 oz

0.453592 kg

17 oz

0.4819415 kg

18 oz

0.510291 kg

19 oz

0.5386405 kg

20 oz

0.56699 kg

21 oz

0.5953395 kg

22 oz

0.623689 kg

23 oz

0.6520385 kg

24 oz

0.680388 kg

25 oz

0.7087375 kg

26 oz

0.737087 kg

27 oz

0.7654365 kg

28 oz

0.793786 kg

29 oz

0.8221355 kg

30 oz

0.850485 kg

31 oz

0.8788345 kg

32 oz

0.907184 kg

33 oz

0.9355335 kg

34 oz

0.963883 kg

35 oz

0.9922325 kg

36 oz

1.020582 kg

37 oz

1.0489315 kg

38 oz

1.077281 kg

39 oz

1.1056305 kg

40 oz

1.13398 kg

41 oz

1.1623295 kg

42 oz

1.190679 kg

43 oz

1.2190285 kg

44 oz

1.247378 kg

45 oz

1.2757275 kg

46 oz

1.304077 kg

47 oz

1.3324265 kg

48 oz

1.360776 kg

49 oz

1.3891255 kg

50 oz

1.417475 kg

Differences Between Ounce and Kilogram

Though used interchangeably, Ounce and Kilogram are contextually different. Look at some of the major differences between the two widely used weighing units.

Basis of Comparison







Used in the imperial system of measurement, commonly in the US and UK

Used in the International system of units (SI) that is followed in most countries.


Quantity is very small

About 35 times larger than an Ounce


1 Ounce = 0.0283495 Kg.

1 Kg = 35.274 Ounces


Used to measure small quantities of weight

Used to measure larger quantities of weight

Some More Useful Article for You : 

Convert Tons To Metric Tons

Tons To Metric Tons

All About Millimeter To Meter

Millimeter To Meter

Guide To Meter To Inches

Meter To Inches

Know About Celsius To Fahrenheit

Celsius To Fahrenheit

Process of Pounds To Kilograms

Pounds To kilograms

Conversion of Millimeters To Centimeters

Millimeters To Centimeters

Frequently Asked Question (FAQs)

How many Kilos are in 5 ounces?

It is pretty simple to convert ounces to kg. 5 ounces multiplied by 0.0283495 is equal to 0.141748

Which is heavier, 1 kg or 2 lbs?

1 kilogram (kg) is equal to 2.20462 lbs which are slightly greater than 2 lbs.

Is a gram bigger than a pound?

As 1 gram is 0.035274 Ounces and 1 pound is 16 ounces, a pound is significantly bigger than a gram.

Why is a pound used instead of a kg?

A pound is an imperial unit used to quantify mass or weight in the United States and the UK. However, kg is an SI unit seldom used in these areas.

What is the formula for converting ounces to kilograms?

The formula to convert ounces to kilograms is Kilograms = value of Ounces x 0.0283495.

How many ounces are in 1 kilogram?

There are 35.274 ounces in 1 kilogram.

What are ounces and kilograms used for?

Ounces and kilograms are both units of measurement for weight or mass. Ounces are used in the United States and a few other countries for measuring the weight of small items such as food or beverages. One ounce is equal to approximately 28.35 grams. Kilograms are used as the primary unit of measurement for weight in most countries, including the vast majority of Europe and Asia. Kilograms are used to measure the weight of larger items such as people, animals, and vehicles. One kilogram is equal to 1000 grams.

Krittika Barua
Krittika Barua Organized, vocal and everything in between. Krittika is an editor at Square Yards, passionate about weaving words with simplicity. She’s a dog lover obsessed with Microsoft Excel. Donuts cheer her up.
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