What Is the Degree of Operating Leverage?
The Degree of Operating Leverage (DOL) measures how sensitive a company's operating income (EBIT) is to a change in sales. A high DOL means that a small percentage change in revenue produces a large percentage change in operating profit — a sign of high fixed costs relative to variable costs. A low DOL indicates a more flexible, variable cost structure with steadier, but less amplified, profits.
How to Use This Calculator
Enter your number of units sold, the selling price per unit, the variable cost per unit, and your total fixed costs. The calculator computes the contribution margin, your operating income, and the resulting DOL multiple. A DOL of 3 means that a 10% rise in sales would lift operating income by roughly 30%.
The Formula Explained
DOL equals Contribution Margin divided by Operating Income. Contribution Margin is (Price − Variable Cost) × Units. Operating Income (EBIT) is Contribution Margin minus Total Fixed Costs. Because fixed costs sit in the denominator, the more fixed costs you carry, the higher the leverage.
$$\begin{gathered} \text{DOL} = \frac{\text{CM}}{\text{CM} - \text{Fixed Costs}} \\[1.5em] \text{where}\quad \text{CM} = \left(\text{Price} - \text{Variable Cost}\right) \times \text{Units Sold} \end{gathered}$$
Worked Example
Suppose you sell 10,000 units at $50 each, with a variable cost of $30 per unit and $100,000 in fixed costs. Contribution Margin = \((50 - 30) \times 10{,}000 = \$200{,}000\). Operating Income = \(200{,}000 - 100{,}000 = \$100{,}000\). DOL = \(200{,}000 / 100{,}000 =\) 2.0×. So a 10% sales increase should raise operating income by about 20%.
$$\text{DOL} = \frac{200{,}000}{200{,}000 - 100{,}000} = 2.0\times$$
FAQ
Is a high DOL good or bad? It depends. High leverage magnifies profits when sales grow but also magnifies losses when sales fall, increasing risk.
What if operating income is zero or negative? At the break-even point operating income is zero and DOL is undefined (it spikes toward infinity); below break-even the ratio turns negative.
How is DOL different from financial leverage? Operating leverage relates to fixed operating costs, while financial leverage relates to fixed financing costs such as interest on debt.
