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Download my Trading Post Fee Calculator that I use. I have the luxury of two screens, but if you don't, then please use your cell phone or calculator. The formulas are custom built by me and I have thoroughly tested them. All you have to do is enter the gold, silver, and copper price, then watch as the spreadsheet instantly calculates how much money you will make once trading post fees are taken out. There's even a cheat sheet going down the left side of the spreadsheet, with 1 to 99 copper already calculated so you don't have to type it in.
Why did I create this spreadsheet? Because I've seen emails with people who break even on the trading post or sometimes lose money. They usually want to know how to stop this from happening.
I use the multiply by .85 rule, which simply means that you need to multiply the price of the item by .85 to see what you will get back for selling at that amount.
If an item is going for 1 silver, I convert to copper (100 copper = 1 silver) and multiply by .85. So I get 85 copper back each time I sell an item for 1 silver. This is all fees, both the 5% listing and 10% successful put together.
So next time you're going to sell an item, do a quick multiplication by .85. Be sure to convert to copper or silver any time you are doing the math as well. And please make use of my trading post fee calculator!