
Ounces to Grains
Converter 
Convert Grains to Ounces (gr to oz)
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Conversion Table
ounces
to grains 
oz  gr 
1 oz  437.5 gr 
2 oz  875 gr 
3 oz  1312.5 gr 
4 oz  1750 gr 
5 oz  2187.5 gr 
6 oz  2625 gr 
7 oz  3062.5 gr 
8 oz  3500 gr 
9 oz  3937.5 gr 
10 oz  4375 gr 
11 oz  4812.5 gr 
12 oz  5250 gr 
13 oz  5687.5 gr 
14 oz  6125 gr 
15 oz  6562.5 gr 
16 oz  7000 gr 
17 oz  7437.5 gr 
18 oz  7875 gr 
19 oz  8312.5 gr 
20 oz  8750 gr 
How to convert 1 ounce (oz) = 437.5 grain (gr).
Ounce (oz) is a unit of Weight used in Standard system.
Grain (gr) is a unit of Weight used in Standard system. Definition of the Ounce
The ounce is defined differently in different systems of measurement. The most common ounce is the international avoirdupois ounce, which is equal to 28.349523125 grams or 437.5 grains. This is the ounce that is used for most purposes, such as measuring food, postal items, fabric, paper and boxing gloves. The avoirdupois ounce is onesixteenth of an avoirdupois pound, which is defined as 7000 grains.
Another ounce is the international troy ounce, which is equal to 31.1034768 grams or 480 grains. This is the ounce that is used for measuring precious metals and gems, such as gold, silver, platinum and diamonds. The troy ounce is onetwelfth of a troy pound, which is defined as 5760 grains.
A third ounce is the apothecaries’ ounce, which is also equal to 480 grains, but it is divided into eight drams instead of twelve pennyweights like the troy ounce. The apothecaries’ ounce is used for measuring medicines and drugs.
There are also other historical or regional ounces that have different values, such as the Spanish ounce, the French ounce, the Portuguese ounce, the Roman/Italian ounce, the Dutch metric ounce and the Chinese metric ounce.
How to Convert Ounces
Ounces can be converted to other units of weight by using conversion factors or formulas. Here are some examples of how to convert ounces to other units of weight in the US customary system and the SI system:
 To convert ounces to pounds, divide by 16. For example, 32 oz = 32/16 = 2 lb.
 To convert ounces to tons (short), divide by 32000. For example, 64000 oz = 64000/32000 = 2 tons.
 To convert ounces to grams, multiply by 28.349523125. For example, 4 oz = 4 x 28.349523125 = 113.3980925 g.
 To convert ounces to kilograms, multiply by 0.028349523125. For example, 8 oz = 8 x 0.028349523125 = 0.226796185 kg.
 To convert ounces to milligrams, multiply by 28349.523125. For example, 2 oz = 2 x 28349.523125 = 56699.04625 mg.
 To convert ounces to micrograms, multiply by 28349523.125. For example, 1 oz = 1 x 28349523.125 = 28349523.125 µg.
Where Ounces are Used
Ounces are used in different countries and regions for different applications and purposes. Here are some examples of where ounces are used:
 In the United States, ounces are used for measuring packaged foods and food portions, postal items, areal density of fabric and paper, boxing gloves and firearms.
 In the United Kingdom, ounces are used for measuring food portions and ingredients, woolen cloth and gold bullion.
 In Canada, ounces are used for measuring food portions and ingredients, precious metals and gems and liquor bottles.
 In Australia and New Zealand, ounces are used for measuring food portions and ingredients, precious metals and gems and baby weights.
 In China, ounces are used for measuring tea leaves and pearls.
 In India, ounces are used for measuring gold ornaments and silk fabrics.
History of Ounces
Ounces have a long history that dates back to ancient times. Here are some highlights of the history of ounces:
 The uncia was an ancient Roman unit of measurement that was onetwelfth of a Roman pound or libra. It was also used as a unit of volume and area.
 The uncia was borrowed into Old English as ynsan or yndsan from a Vulgar Latin form with ts for c before i (palatalization). This became inch in modern English.
 The uncia was also borrowed into Middle English through AngloNorman and Middle French as unce, once or ounce. This became ounce in modern English.
 The ounce was divided into different fractions and multiples, such as the dram, the pennyweight, the scruple and the mark.
 The ounce was used in different systems of measurement, such as the imperial system, the US customary system, the troy system and the apothecaries’ system.
 The ounce was standardized by international agreements, such as the international yard and pound agreement of 1959 and the international troy ounce agreement of 1958.
Example Conversions of Ounces to Other Units
Here are some examples of conversions of ounces to other units of weight:
 1 oz = 0.0625 lb
 1 oz = 0.00003125 ton
 1 oz = 28.349523125 g
 1 oz = 0.028349523125 kg
 1 oz = 28349.523125 mg
 1 oz = 28349523.125 µg
 1 oz = 0.911458333 troy oz
 1 oz = 0.911458333 apothecaries’ oz
 1 oz = 1.041666667 Spanish oz
 1 oz = 0.927272727 French oz
Grains: A Unit of Weight
Grains are a unit of weight that are used for measuring small masses, such as bullets, arrows, and seeds. Grains are derived from the English word grain, which was the name of a seed or a cereal plant. The symbol for grain is gr.
Definition of the Grain
The grain is defined as one seventhousandth of an avoirdupois pound, which is the common unit of weight in the US customary system and the British imperial system. The grain is equal to the troy grain, which is the smallest unit of the troy weight system, which is used for measuring precious metals. The grain is also equal to the apothecaries’ grain, which is the smallest unit of the apothecaries’ weight system, which is used for measuring medicines.
The grain is equal to about 0.0023 avoirdupois ounces or 0.0648 grams. The grain is also equal to about 0.00014 troy ounces or 0.0417 pennyweights.
How to Convert Grains
Grains can be converted to other units of weight by using conversion factors or formulas. Here are some examples of how to convert grains to other units of weight in the US customary system and the SI system:
 To convert grains to avoirdupois ounces, divide by 437.5. For example, 10 gr = 10 / 437.5 = 0.0229 oz.
 To convert grains to avoirdupois pounds, divide by 7000. For example, 5 gr = 5 / 7000 = 0.0007 lb.
 To convert grains to tons (short), divide by 14000000. For example, 20 gr = 20 / 14000000 = 0.0000014 ton.
 To convert grains to kilograms, divide by 15432.3584. For example, 15 gr = 15 / 15432.3584 = 0.000972 kg.
 To convert grains to grams, divide by 15.4323584. For example, 25 gr = 25 / 15.4323584 = 1.6218 g.
 To convert grains to milligrams, multiply by 64.79891. For example, 30 gr = 30 x 64.79891 = 1943.9673 mg.
Where Grains are Used
Grains are used in different countries and regions for different applications and purposes. Here are some examples of where grains are used:
 In most countries that use the SI system, grains are not used for measuring weight, but only for measuring small masses, such as bullets, arrows, and seeds.
 In the United States, grains are sometimes used for measuring small masses, such as bullets, arrows, and seeds.
 In Canada, Australia and New Zealand, grains are sometimes used for measuring small masses, such as bullets, arrows, and seeds.
 In the United Kingdom, grains are sometimes used for measuring small masses, such as bullets, arrows, and seeds.
 In India, grains are sometimes used for measuring small masses, such as bullets, arrows, and seeds.
History of Grains
Grains have a long history that dates back to ancient times. Here are some highlights of the history of grains:
 The grain was originally based on the weight of a single seed of wheat or barley, which was used as a unit of mass in ancient civilizations such as Egypt, Mesopotamia and Greece.
 The grain was part of different systems of measurement, such as the Tower system, the Troy system, the Avoirdupois system and the Apothecaries’ system. It varied from about 40 milligrams to about 80 milligrams depending on the region and the time period.
 The grain was standardized by royal statutes and international agreements in different periods of history. For example, in 1527 an act of Henry VIII fixed the grain at exactly one seventhousandth of an avoirdupois pound; in 1828 an act of Congress adopted the troy ounce as the official unit of weight for coinage in the United States; in 1959 an international agreement defined the international avoirdupois ounce as exactly 28.349523125 grams.
Example Conversions of Grains to Other Units
Here are some examples of conversions of grains to other units of weight:
 1 gr = 0.0023 oz
 1 gr = 0.0001 lb
 1 gr = 0.00000007 ton
 1 gr = 0.000065 kg
 1 gr = 0.0648 g
 1 gr = 64.79891 mg
 1 gr = 0.0042 oz t
 1 gr = 0.0417 dwt
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