What operating leverage means

Some of a company’s costs rise and fall with sales — raw materials, packaging, freight. Others don’t move much whether sales are up or down — rent, salaries, depreciation on the factory. Operating leverage is what that second group does to profits: because fixed costs don’t grow when revenue grows, every extra rupee of sales above the break-even point drops through to operating profit at the contribution margin, not the net margin. Profit grows faster than revenue.

The catch is in the title. The same mechanism runs in reverse. When revenue falls, fixed costs don’t fall with it, and profit shrinks faster than sales. High operating leverage is a description of amplification, not of quality.

The formula

Degree of operating leverage (DOL)  =  % change in EBIT / % change in revenue

  EBIT = earnings before interest and tax (operating profit)

Equivalently, at a point:

DOL  =  Contribution / EBIT  =  (Revenue − Variable costs) / EBIT

A DOL of 2 means a 10% rise in revenue produces roughly a 20% rise in EBIT — and a 10% fall in revenue, a 20% fall in EBIT. The higher the fixed-cost share, the higher the DOL.

Worked example: Desi Bites Foods, two years running

From the case study, FY23 → FY24 and FY24 → FY25:

FY23 → FY24 FY24 → FY25
Revenue growth 20.0% 20.0%
EBITDA growth 32.9% 31.6%
EBIT growth 45.1% 38.7%
DOL (on EBIT) 2.25 1.94

Revenue grew 20% both years; operating profit grew roughly twice as fast. That is exactly what the EBITDA margin post recorded as margins expanding from 14% to 15.5% to 17% — operating leverage is the mechanism behind margin expansion on a growing top line.

Now the forward-looking version. Treat Desi Bites’ FY25 cost of goods sold (62% of revenue) as variable and its operating expenses plus depreciation (₹659 lakh) as fixed:

FY25 actual Revenue +10%, fixed costs flat
Revenue (₹ lakh) 2,592 2,851.2
Contribution margin 38.0% 38.0%
Fixed costs (₹ lakh) 659 659
EBIT (₹ lakh) 326 424.5
EBIT growth   30.2%

A 10% revenue rise becomes a 30.2% EBIT rise. The point-in-time formula agrees: contribution / EBIT = 3.02. (The historical DOL of ~2 is lower because Desi Bites’ “fixed” costs actually grew each year — real companies hire people and add capacity. The point-formula assumes they’re truly frozen.)

Run it the other way. Revenue −10% with the same fixed costs would take EBIT down by about the same 30.2%. A run of 20% growth years flatters a high-fixed-cost business; the first flat year does the opposite.

Worked example: Britannia, FY24 → FY25

From Britannia’s audited FY25 results (year ended 31 March 2025). For illustration only.

FY24 → FY25
Revenue growth 7.0%
EBITDA growth 0.5%
EBIT growth 0.2%
DOL (on EBIT) 0.02

Revenue up 7.0%, operating profit essentially flat. A DOL of 0.02 — almost no leverage at all. (DOL is computed from the unrounded growth rates, so it differs a touch from dividing the rounded figures shown.) That isn’t because Britannia has no fixed costs; it’s because the variable cost line jumped. Cost of goods sold (materials, mostly) grew 11.7% against revenue’s 7.0%, and that swallowed the operating leverage the fixed-cost base would otherwise have delivered. The gross margin post recorded the compression. Operating leverage is one lever among several, and in FY25 the input-cost lever was pulling harder.

This is the honest caveat on the whole concept: DOL measured from two years’ results captures everything that happened to costs in those years, not just the fixed/variable structure. Over a single year it can be noise.

🧒 Explain it like I'm 10 (optional — skip if this is already clear)

You run a lemonade stand. The table rental is ₹100 a day no matter what. Each glass costs ₹5 to make and sells for ₹10.

Sell 30 glasses: ₹300 in, ₹150 for lemons, ₹100 rent — you keep ₹50. Sell 33 glasses (10% more): ₹330 in, ₹165 lemons, still ₹100 rent — you keep ₹65. That’s 30% more profit from 10% more sales, because the rent didn’t grow.

But sell 27 glasses and you keep only ₹35 — 30% less profit. The rent didn’t shrink either.

Common mistakes

  • Reading margin expansion as management skill when it’s operating leverage on a growing top line. The test is what happens in the first flat year.
  • Assuming high operating leverage is good. It’s good in growth and bad in decline. Ask which one you’re expecting.
  • Computing DOL from one year of results and treating it as structural. Britannia’s 0.02 says more about FY25’s commodity prices than about its cost structure.
  • Confusing operating with financial leverage. Operating leverage comes from fixed costs; financial leverage from fixed interest, covered in the debt-to-equity and interest coverage posts. A company with both is doubly amplified in both directions.

Takeaway: operating leverage is fixed costs turning revenue growth into faster profit growth — and it runs in reverse just as hard. Measured over a single year, as Britannia’s near-zero FY25 figure shows, it describes that year, not the business.