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LUNAR silver coins 1st Series:

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"A Troy Ounce is more than an ounce"


How can a Troy Ounce be more than an ounce ?

Precious metals such as gold and silver are often sold by the troy ounce. Many people don’t realize that an ounce of gold (and other precious metals) is weighed in a different weighing system called "troy weights".  A troy ounce is heavier than the typical ounce found at the grocery store.

In many English speaking countries there are two systems for measuring weight. 

One, for precious metals, called the troy ounce.

The other is for Commodities such as sugar, grains, and the typical grocery items. It is called the avoirdupois ounce.

Avoirdupois weights   

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".

So what do you get when you buy an ounce of precious metal ?

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.

1 troy ounce of silver round

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.

Troy weights

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

31.1 grams

One avoirdupois ounce weighs

28.35 grams

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.

In Summary:

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

"Comparing Different Pounds"

Note: All weights and formulas are approximate.

Most gold and silver bullion type coins, including the US SILVER EAGLE dollar coins and the AMERICAN GOLD EAGLES coins, are weighed in troy ounces.

 

Please email us with any questions you may have: jlynn@aeneas.net

 

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Basics Food Storage program for disasters

It's one thing to buy precious metals for protection against economic uncertainty.  Some customers prefer gold or silver bullion coins.  If you've done likewise, good for you.

But, have you considered what you will eat in those times?

We recommend Freeze Dried foods from Emergency Essentials for long term nutritious storage.  The costs can run about what you would pay per meal at a lower cost family restaurant.

Their shipping costs are no more than $12, even on large size orders.

buy Freeze Dried Foods for emgergency storage

Wavelength Emergency Radio, Charger & Flashlight

 

One Week MRE (Meal Ready to Eat) Food Supply

 

Year Supply of Survival Food Basics

 

72 Hour Kits, Survival Kits, & Emergency Kits

 

Water Purification Tablets

 

Freeze-Dried Foods in #10 Cans

 


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All metal prices quoted, information, and opinions you see on this site come from what is expected to be reliable sources. Precious metals data and other facts may show past performance and this does not guarantee future results.  Do the possibility of error, omission, and events beyond our control, no warranty or guarantee is expressed or implied as to the accuracy of any information or quote. We recommend that you carefully examine and research the risks and rewards associated with investing in physical precious metals before you make a purchase.
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