How does it work?

The Profiteering tool - as it currently stands - serves as a gauge of how much profit you can gain by crafting items with all of the materials bought at the current average market price. The recipes are pulled from XIVAPI while the market prices are taken from Universalis. Without these two resources, this tool would not exist.

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I don't understand what all the numbers mean.

Potential Gross: This is the average sale price of the item based on the last 5 sales. It reflects how much you could potentially earn by selling it.^*

Total Cost: This is the sum of all "Mkt Cost" values, representing how much you'd spend buying all the materials from the marketboard.^**

Potential Profit: This is the difference between the potential gross and total cost. A positive number means profit; a negative number means you're likely losing money.

^*Note: Market prices fluctuate due to factors like item quality, demand, and time since the last sale. Always check your local marketboard for current prices, as this tool uses average past sales for faster, though less accurate, estimates.

^**Note: You may need to buy more materials than required, making your actual costs vary from the tool's calculation.