A Marginal Cost Formula Example Here is an example of how to calculate marginal cost: Big Dynamo is a toy company that produces robot toys. Every month, they produce 2,000 robot toys for a total cost of $200,000. They expect to produce 4,000 robot toys next month for $250,000. Marginal Cost Current production amount 2000 Current production cost $200,00 Future production amount 4000 Future cost of production $250,00 Marginal Cost Formula Since we know that Marginal Cost = (Change in Total Cost)/ (Change in Quantity), we have: Change in total cost = (250,000-$200,000) = $50,000 Change in total units = (4000-2000) = 2000 So, the marginal cost equals $50,000/2000 = $25 Note that the marginal cost represents the change in the cost of a good, not the total cost of the good itself. This $25 represents the margin change. $25