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"A Troy Ounce is more than an ounce"
Here in the USA we often use the avoirdupois ounce for everyday weighing. Every time you step on the scale at home, or weight food found in the grocery, you use the avoirdupois ounce weight system. There are 16 avoirdupois ounces in a pound.
One avoirdupois ounce = 28.35 grams (or 437.5 grains).
(However, one troy ounce = about 31.1 grams)
1 avoirdupois pound contains 16 (avoirdupois) ounces. This makes an Avoirdupois pound equal to about 453.6 grams, or the equivalent of 14.583 "troy ounces".
The troy ounce is heavier than the typical grocery store (avoirdupois) ounce used in the USA. When you purchase a 1 ounce silver or gold coin, you are receiving a "troy" ounce. If you put that same 1 troy oz. coin on a grocery store scale you will find that it weighs about 10% more than the food (avoirdupois) ounce you are familiar with. It will weigh about 1.1 avoirdupois ounces. A troy ounce is equivalent to about 31.1 grams.
Separately, the troy weight system has it's own definition of a "troy" pound. A "troy pound" contains 12 "troy" ounces or 373.24 grams (which is over 13 avoirdupois ounces).
It is thought that the troy ounce got it's name from a weight system used in Troyes France during the Middle Ages.
One troy ounce = 480 grains, or 31.10 grams.
There are also 20 pennyweights to a troy ounce.
A troy pound contains 12 troy ounces (over 13 avoirdupois ounces) and is equivalent to 373.24 grams. 32.15 troy ounces = 1 kilogram.
Consequently, a grocery store pound which weighs 16 avoirdupois ounces (or 453.59 grams) will contain about 14.58 troy ounces.
Perhaps an easy way to compare Troy ounces versus avoirdupois ounces is to look at how they weigh using the metric system
One troy ounce weighs
One avoirdupois ounce weighs
How to convert regular (avoirdupois) ounces to a troy ounce
Use this formula for an approximation when converting grocery store type weights to troy ounces.
Multiply # regular ounces X .912 to get approximate # troy ounces
Examples: A grapefruit weighs about 127.5 grams, or 4.5 avoirdupois ounces.
4.50 x .912 = 4.10 troy ounces.
Ten troy ounces are equivalent to about 10.96 regular ounces.
Because each troy ounce is heavier, it would take almost 11 regular ounces to equal ten troy ounces.
A troy ounce is heavier than an avoirdupois ounce
(1 avoirdupois ounce = 28.35 grams, a troy ounce = 31.1 grams)
A troy pound is lighter than a avoirdupois pound because it contains fewer ounces.
(Troy pound contains 12 troy ounces, avoirdupois pound contains 16 avoirdupois ounces. Even though the troy ounces are heavier, that difference is not enough to make troy pounds heavier.)
Need more information about "Pounds"?
See our related Coin Question & Answer page
Note: All weights and formulas are approximate.
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