A significant advantage of some business ideas is that the venture can break even at what seems to be an easily achievable volume. A technique for quantifying that volume, called break-even analysis, examines the interaction among fixed costs, variable costs, prices, and unit volume to determine that combination of elements in which revenues and total costs are equal.

Fixed costs are those expenses necessary to keep the business open, and are not impacted by sales volume. They will include such things as rent, basic telephone expenses and utilities, wages for core employees, loan or lease payments, and other necessary expenditures. An entrepreneur should also include a living wage for himself/herself as a fixed cost.

Variable costs include those expenses that change as a result of sales volume. This can be a relatively simple relationship, as in cost of goods sold, where for example the variable cost of baked goods sold at a coffee shop is what we pay the baker for them, $0.30 each. Variable costs can also be very complex; for example, higher sales in one area of our business may increase long distance charges. Labor costs may be fixed for full-time employees, then, as sales increase, some overtime is incurred until additional personnel can be justified.

Generally, an initial break-even analysis focuses on a relatively narrow range of sales volume in which variable costs are simple to calculate. The variable cost in a coffee shop is simply the cost of goods sold. For a pizza delivery operation, it might be the cost of ingredients, and some cost allocated for operation of the delivery vehicle. A general term often used for the difference between selling price and variable cost is