Weight Units Converter

Weight Converter Chart Table

Please use the mass and weight converter if you want to convert any other mass and weight units that aren't already listed in the conversion form. The height chart below provides rounded conversions from kilogrammes to stones and pounds, up to two decimal places.

Use this weight conversion table to help you understand how to convert between these units. Conversion tables and charts are quite beneficial. They demonstrate the equivalence of various units of any magnitude, not just weight. For instance, similar conversion tables for lengths exist, such as in our tool for converting lengths.

Weight Calculator

The best tool for converting between different weight units is Myfavetools' online weight converter. We provide both a real-time weight conversion tool and a weight conversion table that makes it simple to change between units, such as pounds to kilogrammes, kilogrammes to pounds, ounces to stones, and so on. For those who are interested, we will also go over bodyweight.
There are various units systems for measuring weight, just like there are for other physical quantities (mass). The International System (SI) and its units, including kilogramme (kg), gramme (g), and decagram, are the most widely used and well accepted. The Imperial System, which includes units like the pound (lbs) and the ounce, is another important system of units (oz). These are not the only unit systems in use today, though as you can see below and in the weight converter tool.

The Concept of Weight

IMPORTANT! Weight is defined differently in the technical sense than it is in our common understanding. In a technical sense, weight is a force, more specifically the force that the Earth (or another planet) applies to an item. It can only be measured in Newtons and similar quantities, not in kilogrammes, pounds, or tonnes.

Mass, which measures the amount of matter in an item, is what we typically refer to as "weight" in our daily lives. The Earth pulls us in with a gravitational force that is essentially constant. Hence, by simply multiplying or dividing it by the Earth's gravitational acceleration, or g, we can use mass and weight practically interchangeably. If you are still interested in learning more, weight is measured using the same units as force.
We shall discuss mass units but call them weight units to avoid ambiguity or unneeded complexity. We use informal language rather than technical language. For those who prefer to be more technical and exact, we would like to remind you that an object with a mass of 1 kg will weigh 9.8 N. So from now on, we'll state that this thing "weighs" 1kg.

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Are mass and weight interchangeable terms?

Although mass and weight are not the same thing, we can continue to use this analogy as long as we remain on Earth. You will now see a very well-known illustration that will clarify why this is the case. We'll cover the well-known Galilean free-fall experiment in this experiment. Let's first think about the experiment with no air resistance.

In a nutshell, the experiment involves dropping two identically weighted items from a certain height. Both objects should touch down at the same moment if there is no friction force (zero air resistance). We suggest using our free-fall calculator, where we will concentrate more on the relationship between force and weight, to understand more about the experiment itself.
We refrain from discussing the free-fall experiment with air resistance since the object's shape becomes crucial. Also, you would have to look out for changes in air density, which would serve only to confuse you and take away from the main aspects that we want to talk about: weight, mass, and gravity.
Because weight and mass are proportional to one another, we can discuss them in daily life. Let's use Newton's second law to illustrate this. According to this rule, any object's mass and force are proportionate to its rate of acceleration. F = m * a, where m is the mass of the item, an is the acceleration, which for a falling object is g, or the gravitational acceleration, and F is the force (for us, it is the weight).

The crucial finding of this experiment is that the downward acceleration for all things on Earth will always be the same, or roughly g = 9.8 m/s2. As a result, even if the weight F and the mass m are not the same, they are absolutely proportionate and can be used to transform one into the other.
It is not true, though. Moving from one planet to another causes things to become a little more challenging. This example, which will also help to clarify the distinction between mass and weight, will be covered in more detail in the section that follows.

Convert pounds to kilogrammes and kilogrammes to pounds…

By hand, changing from one weight unit to another can be simple (for example, to change from kilogrammes to grammes, you simply multiply kilogrammes by 1000) or difficult (for example, changing from pounds to kilogrammes or kilogrammes to pounds), but using a weight converter like this makes everything simple as pie.
With the help of this weight converter, you may quickly and easily change the units between grammes and stones, kilogrammes and pounds, or any other two you like. The complete list of available units is provided below:
Microgram (g): One millionth of a gramme; milligramme (mg): One thousandth of a gramme; gramme (g); kilogramme (kg): One thousand grammes; metric tonne (t): One thousand kilogrammes; grain (gr): One thousandth of a pound; drachm (dr): One sixteenth of an ounce; ounce (oz): One sixteenth of a pound US tonne, also known as a short tonne, is 2000 pounds. US tonne, also known as a long tonne, is used in the UK and is 2240 pounds. Stone (st), which is 14 pounds, is frequently used to quote a person's weight.

Pound (lb)

The pound is most likely the imperial unit of weight measurement that is used the most, particularly in nations that have embraced the International System, such the US, UK, and Canada. The libra, a Roman weight measurement, is where the pound got its start. Hence, lb is used as the abbreviation. The British pound (with varied definitions and values) developed from there, eventually becoming the pound that we know today.

The fact that the pound was initially used to measure both force and mass is an essential observation about it. You shouldn't be shocked by this if you've read the disclaimer up there. The pound was separated into pound-mass and pound-force depending on what quantity you wanted to measure once the distinction between mass and force was established. As we have already stated, as long as we remain on the same planet, they are essentially equal.

Today, there is no regional variation in the value of the pound. It is now governed by law and has a set value for everyone, everywhere. It is only reasonable to define the pound in reference to the kilogramme because the SI-units are employed in science and because the kilogramme has undergone extensive refinement (as you will see in a moment). The legal definition of a pound is 1 lb = 0.45359237 kilogrammes, which results in a conversion from kilogrammes to pounds of 1 kg = 2.20462 pounds. 

Stone (st) (st)

The origin of the name "stone" is straightforward to comprehend. It originates from a time when people used a Roman-style balance with a stone counterbalance to measure the weight of goods. The unit became standardised to the stone with the development of measurement methods, thus its value is no longer based on the size of the stone you select.
In the British Isles and Ireland, the stone is mostly used to measure people's weight rather than as a standard measurement. Ironically, you would weigh your meal in pounds even if you may have gained 20 st from eating too much for too long. According to the dictionary, a stone is defined as 1st = 14 pounds = 6.35029318 kg.

Ounce (oz) (oz)

The ounce is the final unit we shall thoroughly describe. The reason we saved it for last is that it completes the "puzzle" of the Imperial System units. The ounce, like the stone and the pound, has a historical and customary origin, which means that until very recently, there was no defined value for the ounce across all locations. When people realised how crucial it was to have effective communication across regions, nations, and continents, the definition of an ounce was also given.
Yet, because the ounce is defined as 1/16 lb under the Imperial System, defining the ounce is much simpler. The SI value of an ounce can then be obtained by converting from lbs to kg. It is possible to convert kilogrammes to ounces the opposite way around. You must convert kilogrammes to pounds, and then pounds to ounces. The following are the equivalents: 1 oz = 0.0625 lbs = 0.0283495 kg and 1 lbs = 16 oz = 0.45359237 kg, respectively.

SI units

Let's examine the definition of the kilogramme unit in more detail now. You must keep in mind that as global trade grew, measurements had to be standardised between countries and boundaries before the story can begin. Living in a society where people weigh themselves using random stones and measure distances using their own feet is simply unacceptable. It was obvious that there was a need for a universal unit that would always be the same.

This is how the search for the ideal standard in science got started. In order for us to always be able to look back to a perfect scientific standard, even if the entire planet were torn apart, it should not only be the same for everyone everywhere (like following a reference design), but also be one that is determined by nature herself.

One litre of water weighed one kilogramme in its original definition. This, although still having issues, is already an improvement over "the weight of stone". Several of these are caused by how water density varies with temperature and pressure, necessitating the establishment of some standard values for those magnitudes as well. The main issue is that other man-made units are included in the definition, which means that if the definition of a litre is lost (or misunderstood), the definition of a kilogramme will also be lost.

The kilogramme is still defined today in accordance with a piece of metal that is securely kept in Paris and has copies all around the world. This won't persist, though, as there are now two methods being used by several scientists to definitively redefine the kilogramme. The first method uses an electromagnetic balance and some clever physics to define the kilogramme in terms of Planck's constant and Avogadro's number.

The second method, which is seen in the video below, involves using the cleanest, most ideal silicon sphere to create exactly one kilogramme of Si14. A new kilogramme would therefore be defined in terms of the quantity of Silicon 14 atoms required to attain that weight.

It's vital to remember that this won't affect how we convert kilogrammes to pounds or how valuable a kilogramme actually is. It would merely provide us with a means of creating a kilogramme (and all other units) in the event that we lose the reference kilogramme or travel to a planet where the environment may be significantly different.

A manual on mass and weight for space travellers

As the gravitational acceleration remains constant when we remain on the same planet, we have already demonstrated that mass and weight are interchangeable. The value of g, and thus the relationship between mass and weight, change when we travel from one planet to another. Because of this, discussing weight in terms of mass (from lbs to kg, via grammes, and stones) is unrealistic, and we must be more careful with the details. Let's observe what transpires.

Because each planet has a unique mass, radius, and chemical makeup, the forces it produces are very diverse. Because of this, an object (with constant mass) has a varied weight depending on the planet it is on and gravitational acceleration isn't constant. If you don't believe us, you may use our calculator to determine the impact on other planets and even create a planetary weight conversion chart for yourself if you don't believe us. However, this time, instead of translating pounds to kilogrammes, it will convert weight on one planet to weight on another (or vice versa).
Practically speaking, this means that while a body's weight varies across planets, its mass does not. So, it is less practical to talk about weight in kilogrammes if you additionally have to provide the g value for each planet. If we discovered a planet exactly the same size and mass as the Earth, it would be an exception. The density of this planet would be the same.

When we immerse oneself in a liquid, such as water, the mass and weight can also alter independently in this situation. The value of g is constant in this situation, but buoyancy is a new factor that enters the picture. It is an upward force that liquid applies to a body inside of it in order to overcome the gravitational pull (weight). In our buoyancy calculator, you may find out more about buoyancy and its characteristics. This phenomena is probably already familiar to you under the name of Archimedes' principle and the legend of how he helped the monarch identify a fake golden crown using only water.

Weight in Relation to Human Body

We have already covered weight, our weight converter tool, various weight conversion tables, and weight units. In essence, we have discussed weight (or mass) as a physical quantity, solely from a physics perspective. The relationship between weight and our body weight, however, is the most fascinating feature of weight.

Weight and body weight are important to most of us, both in terms of beauty and health. In actuality, this is also true of animals, particularly farm animals like horses. It would require several days' worth of reading to completely cover such a large subject. But, since you are already here and this subject may be very important to you, we would like to highlight some important issues. We're sure you'll find lots of useful information in the sports and health sections of our website.
 

As a general rule, improving your diet and exercising more will always be beneficial to your health. Cycling to work is far healthier for you and the environment than driving a car, especially when compared. Although it's also a good idea to walk, giving up smoking is the single best thing you can do for your health.

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