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Message:: [QUOTE="kanga, post: 3373485, member: 9270"]I use a spreadsheet. But the hard part is assigning a value to each coin.For the last 20 years I've been recording how much I've paid for each coin.That leaves a lot of coins out since a good portion of my collection was acquired before that.But those are mostly my lower value material. So what other pricing sources are available?Auction results would be the most accurate.BUT they may not cover many of the grades you have acquired.You buy a coin in XF-45 but can only find results for XF-40 and AU-50.Do you take the mid-point between those two values?That would be sort of accurate but the scale is not linear.The more correct answer would be something lower than the mid-point. eBay is nice because lots of lower valued items are sold there.But at the same time lots of buyers overpay.And remember to only count the coins that actually sold. Otherwise use some online valuing source.DON'T USE THE RED BOOK.I believe both PCGS and NGC have their pricing guides.Then take about 75-80% of those values.That will get you in the ballpark.[/QUOTE]