This margin calculator will be your best friend if you want to find out an item’s revenue, assuming you know its cost and your desired profit margin percentage. That’s not all though, you can calculate any of the main variables in the sales process – cost of goods sold (how much you paid for the stuff that you sell), profit margin, revenue (how much you sell it for) and profit – from any of the other values. In general, your profit margin determines how healthy your company is – with low margins you’re dancing on thin ice and any change for the worse may result in big trouble. High-profit margins mean there’s a lot of room for errors and bad luck. Keep reading to find out how to find your profit margin and what is the gross margin formula.