How To Calculate Silver Bullion Weight

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Author	Replies: 4 / Views: 1,595
swollibman New Member New Zealand 48 Posts	Posted 02/19/2014 11:57 pm Hi everyone This question has probably been asked before but after extensive searching of the forums and Google I haven't been able to find a definitive answer. I'm quite new to all of this. I have some junk silver coins that are 92.5% silver (sterling) and I want to auction them off. What measurements should I put in the auction? I have heard troy ounces is preferred, but I live in New Zealand where the metric system is used. So do I weigh the coins and then multiply that value by .925 ? Or do I just write the total weight of the coins? Similarly, if I have coins that are 0.500 purity, do I multiply the total weight of the coins by 0.500? This may seem a stupid question but as there is quite a large quantity of coins to be auctioned off, I want to be absolutely sure I am giving the right information in order to avoid troubles with the buyer further down the line. Kind regards Leon Report this Post to the Staff

duncanbishop24 Pillar of the Community United States 898 Posts	Posted 02/20/2014 12:44 am This might take a bit of math. 1 troy ounce = 31.1034768 grams. 1 gram = .0321507466 troy ounces. Your coin is 92.5% (.925) silver so using the following: W= weight of your coin in grams, S= Spot price 1 troy oz of silver. P= Purity of coin (SWP.0321507466)=Silver melt value of coin. Silver is about 21.50 per troy ounce. Lets say your coin was 5 grams in weight. 92.5% coin would look like this (21.505.925.0321507466)= $3.1969(you probably don't use US dollars in New Zealand though huh?) 50% coin with same weight. (21.505.500*.0321507466)= $1.7281 Hopefully this wasn't too confusing and it helped. Feel free to ask more or provide weights, etc. Report this Post to the Staff
swollibman New Member New Zealand 48 Posts	Posted 02/20/2014 01:33 am Thanks a lot for your help Duncan. So, I've changed the mode on my scales to troy ounces. Would I be correct in saying that for my 0.500 coins, I can weigh them in troy ounces, then halve that value, then multiply that value by the silver spot price to get the silver value of those coins? Report this Post to the Staff
Biancasdad Pillar of the Community United States 1045 Posts	Posted 02/20/2014 02:26 am Leon, That is correct sir. Report this Post to the Staff
SsuperDdave Moderator United States 23522 Posts	Posted 02/20/2014 11:06 am Your country uses the metric system. Use that system, most familiar to your potential buyers, to express weights. Give both numbers - total weight and net silver weight, corrected for alloy - and let your buyers determine their own melt values. They're all making a values judgment regarding the worth of your coins to themselves, anyway. Your "cull" coin might be the one they need to fill a hole and therefore worth more than melt to them. Report this Post to the Staff
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