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Common weight unit and definitions


The kilogram is the base unit of mass in the International System of Units

The kilogram is defined equal to the mass of theInternational Prototype of the Kilogram (IPK)

One kilogram= 1000 gram

One kilogram= Approximately 2.2046 avoirdupois pounds

kilopound (Kip)

The kilopound (kip) is an Imperial unit of force

One kip equals to 1000 pounds-force or one half of a short ton

1 kip = 4448.2216 N = 4.4482216 kN

Troy ounce (oz t)

The troy ounce (oz t) is a unit weight in the imperial measure system.

It is commonly used in measurement of precious metals.

One troy ounce is defined equal to 31.1034768 g,

The troy ounce is about 10% heavier (ratio 192/175) than the avoirdupois ounce which is 28.349523125 g.


The ounce is a unit of mass measurement.

There are 2 definition of ounce that is commonly used today

the avoirdupois ounce which equal to approximately 28.3 g that is used in the imperial and United States customary system of units

and the troy ounce of which is approximately 31.1 g which is used to measure precious metals

one avoirdupois ounce = 1/6 avoirdupois pound

Some countries have redefined their ounces in the metric system like german

The unit metric ounce is 25 grams

20 make the metric pound of 500 grams

Pound (lb)

The pound or pound-mass is a unit of mass that is used in the imperial, United States customary systems of measurement

the international avoirdupois pound is defined as exactly0.45359237 kg or 16 avoirdupois ounces.

Grain (gr)

The grain is a unit of measurement of mass

One grain equals to 64.79891 milligrams

Grain is nominally based upon the mass of a single seed of a cereal.

1 gram is approximately 15.43236 grains.

The unit formerly used by jewellers to measure pearls, diamonds, or other precious stones, called the jeweller’s grain or pearl grain, is equal to 1⁄4 of a carat, or 50 mg (~ 0.7716 gr).

The grain was also the name of a traditional French unit equal to 53.115 mg.

(from wikipedia)

7000 grains =1 avoirdupois pound

5760 grains = 1 troy pound

The unit grain is commonly used to measured to weight of bullets and propellants and in dentistry to measure teeth

Carat (ct)

The carat is a unit of mass used to measure gems and diamonds

One carat equal to 200 mg

Dram (unit)

The dram is a unit of mass

In avoirdupois system the dram is 1⁄256 pound or 1⁄16 ounce or 1.7718451953125 grams
“Dram” is also used as a measure of the powder charge in a shotgun shell

The fluid dram is defined as 1⁄8 of a fluid ounce

In the US customary units

A fluid dram = 3.6966911953125 ml

In the Imperial units

A fluid dram = 3.5516328125 ml