Companies use break-even analysis to determine the prices they need to charge to cover both their variable and fixed costs. Fixed and variable costs are the two costs involved in break-even analysis.

A half-point dip may not be enough to offset closing costs. Here's the magic number that makes refinancing pay off.

If your goal is to save money, you'll want to calculate the break-even point on a mortgage refinance, which is when the savings from refinancing exceed the costs.