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It was updated to its current form in It is a system that was based on a physical standardized pound that used a prototype weight. This prototype weight could be divided into 16 ounces, a number that had three even divisors 8, 4, 2. This convenience could be the reason that the system was more popular than other systems of the time that used 10, 12, or 15 subdivisions. Current use: The pound as a unit of weight is widely used in the United States, often for measuring body weight.

Many versions of the pound existed in the past in the United Kingdom UK , and although the UK largely uses the International System of Units, pounds are still used within certain contexts, such as labelling of packaged foods by law the metric values must also be displayed.

The UK also often uses both pounds and stones when describing body weight, where a stone is comprised of 14 pounds. A new definition of the kilogram was introduced in based on Planck's constant and changes to the definition of the second. Prior to the current definition, the kilogram was defined as being equal to the mass of a physical prototype, a cylinder made of a platinum-iridium alloy, which was an imperfect measure. This is evidenced by the fact that the mass of the original prototype for the kilogram now weighs 50 micrograms less than other copies of the standard kilogram.

Current use: As a base unit of SI, the kilogram is used globally in nearly all fields and applications, with the exception of countries like the United States, where the kilogram is used in many areas, at least to some extent such as science, industry, government, and the military but typically not in everyday applications.

Definition: A pound symbol: lb is a unit of mass used in the imperial and US customary systems of measurement. The international avoirdupois pound the common pound used today is defined as exactly 0.

The avoirdupois pound is equivalent to 16 avoirdupois ounces. The avoirdupois system is a system that was commonly used in the 13 th century. Here are some instructions for how to enable JavaScript in your browser. Popup calculator Copy a link to this page Print this page Email a link to this page Scroll up to form What does this mean?

Quick Search:. Round decimal places : 1 2 3 4 5. Round decimal places : 1 2 3 4 5 Convert. Use this weight conversion tool to convert between kilograms, stone, pounds, ounces, grams and other units of weight.