THE NUMORIX GUIDE
How to use the Degree of Financial Leverage Calculator
Last reviewed September 14, 2026
What this calculator does
Degree of financial leverage compares the percentage change in earnings with the percentage change in EBIT: DFL = percent change in earnings or EPS / percent change in EBIT.
Formula and method
Degree of financial leverage compares the percentage change in earnings with the percentage change in EBIT: DFL = percent change in earnings or EPS / percent change in EBIT. Interest and other fixed financing costs create this sensitivity.
Variables and inputs
Enter the original and new EBIT values and the corresponding original and new earnings or EPS values. Use matching periods and units; do not mix per-share values with total earnings unless the comparison is constructed consistently.
Worked example
If EBIT rises from $100,000 to $110,000, the change is 10%. If earnings rise from $20,000 to $24,000, the change is 20%. DFL = 20% / 10% = 2.0 under those assumptions.
How to interpret the result
A larger DFL means fixed financing costs make earnings more sensitive to operating changes. It can increase shareholder upside but also increases downside exposure when EBIT falls.
Common mistakes to avoid
Do not use revenue as the denominator in DFL. Keep interest expense and tax treatment consistent between scenarios. Check that earnings are measured after the fixed financing costs the ratio is intended to capture.
Assumptions and limitations
DFL is a scenario sensitivity ratio, not a credit-quality score. It does not assess liquidity, covenant terms, refinancing risk, tax changes, or whether the capital structure is appropriate.
Practical use and checks
Degree of financial leverage estimates how sensitive equity earnings can be to a change in EBIT when interest expense is fixed. Enter EBIT of $200,000 and interest expense of $30,000 as a check. The result should be about 1.1765, since DFL equals 200,000 divided by 170,000. As a rough interpretation, a 10% change in EBIT would correspond to about an 11.8% change in the earnings measure before considering taxes, preferred dividends, or other effects. The number is a sensitivity around the supplied operating point, not a forecast of next year's earnings. Use it when comparing capital structures or stress-testing debt service, and keep EBIT and interest from the same period. A value near 1 suggests modest amplification; a much larger value means the fixed interest burden is consuming more of EBIT. If EBIT approaches interest expense, the denominator approaches zero and the ratio can become extremely large or change sign, so that edge case is a warning about coverage rather than a useful ranking. The engine returns 0 when EBIT is exactly zero and uses simple threshold labels. It does not model taxes, preferred dividends, changing rates, refinancing, multiple debt layers, or negative operating income. Pair this screen with interest coverage and cash-flow analysis before making a borrowing decision.