Skip to content

Gross margin vs contribution margin

Gross margin is gross profit over revenue. Contribution margin is price minus variable cost per unit, used to find a break-even count. On the wholesale sheet the margin is 35 percent. On the break-even sheet it is $15 a unit. They are different objects.

 Gross marginContribution margin
FormulaRevenue minus cost of goods, over revenue.Price minus variable cost per unit.
Teaching sheet$700,000 of gross profit on $2,000,000 of sales is 35 percent.$15 a unit on a $35 price. $24,000 of fixed costs break even at 1,600 units, or $56,000 of sales.
Where it livesThe income statement, a stretch of time.A planning identity for volume, one product at a time.
What it is forWhat share of each sale survives its direct cost.How many units cover the fixed costs.
What it is notA break-even count. A 35 percent gross margin is not a 35 percent contribution margin.A statement ratio. The $15 does not appear as a line on the accounts.
When they sit near each otherA one-product firm whose cost of goods is almost all variable, and whose variable selling costs sit below the gross profit line.Same case. The moment overheads sit inside cost of goods, or variable selling costs sit below gross profit, they split.
On this page

A share of sales, against a dollars-per-unit gap

Gross margin asks: of every dollar of sales, how much is left after the cost that only exists because the sale happened? On $2,000,000 of wholesale sales and $1,300,000 of cost of goods, gross profit is $700,000 and the margin is 35 percent. The business ratios calculator prints that next to the current and quick ratios so a liquid wholesaler is not confused with a high-margin firm.

Contribution margin asks: after this unit has paid for itself, how many dollars are left for the fixed costs? At a $35 price and $20 of variable cost the margin is $15. $24,000 of fixed costs over that $15 is 1,600 units, or $56,000 of sales. The break-even calculator is that count.

Those are two teaching sheets, not one firm. Lining 35 percent up next to $15 and calling the gap a finding mixes a year of accounts with a per-unit plan.

How gross margin works is the statement ratio. How contribution margin works is the per-unit identity. How break-even analysis works is the unit count that identity feeds.

Mixing them writes a break-even that will not match the books

Treat a 35 percent gross margin as a 35 percent contribution margin and the unit count will not match the accounts, because overheads inside cost of goods, or variable selling costs below the gross profit line, have been quietly moved. Fixed costs and variable costs are the split break-even needs. Cost of goods is an accounting line that can hold both.

A software-shaped sheet on the same $2,000,000 of sales with $300,000 of cost of goods prints $1,700,000 of gross profit and an 85 percent margin. That 85 percent is still not a contribution margin until you have named the variable cost per unit. This is educational material, not financial advice.

Worked examples

A wholesaler, 35 percent gross margin

A distributor holds $600,000 of current assets, of which $160,000 is inventory, against $400,000 of current liabilities. Over the year it sold $2,000,000 of goods that cost $1,300,000 to buy. What do the three ratios read?

  1. Current ratio is current assets over current liabilities: 600,000/400,000=1.50600{,}000 / 400{,}000 = 1.50.
  2. Take the inventory out to get the quick assets: 600,000−160,000=440,000600{,}000 - 160{,}000 = 440{,}000.
  3. Quick ratio divides that by the same liabilities: 440,000/400,000=1.10440{,}000 / 400{,}000 = 1.10.
  4. Gross profit is revenue minus the cost of goods sold: $2,000,000 minus $1,300,000 is $700,000.
  5. Gross margin is gross profit over revenue: 700,000/2,000,000=0.35700{,}000 / 2{,}000{,}000 = 0.35, which is 35 percent.

The current ratio is 1.50 and the quick ratio is 1.10, so the next year of bills is covered either way you count. Gross margin is 35 percent, meaning $700,000 of the $2,000,000 in sales is left over to pay wages, rent and everything else that is not the cost of the goods themselves.

A software-shaped sheet on the same \$2,000,000 of sales

The same $600,000 of current assets and $400,000 of current liabilities, but inventory is $0. Sales are still $2,000,000. Cost of goods is $300,000. What is gross profit?

  1. The current ratio is identical: 600,000/400,000=1.50600{,}000 / 400{,}000 = 1.50.
  2. Nothing comes out for inventory, so the quick ratio is the same 1.50.
  3. Gross profit is $2,000,000 minus $300,000, which is $1,700,000.
  4. Gross margin is 1,700,000/2,000,000=0.851{,}700{,}000 / 2{,}000{,}000 = 0.85, which is 85 percent.

Gross profit is $1,700,000, an 85 percent margin on $2,000,000 of sales. That 85 percent is still not a contribution margin until you have named the variable cost per unit.

Fixed costs of \$24,000 at a \$35 price

Your fixed costs are $24,000 for the year. Each unit sells for $35 and costs $20 to make. How many units do you have to sell to break even?

  1. Find the contribution margin: $35 minus $20 leaves $15 a unit.
  2. As a share of the price that margin is 15/35=0.42857115/35 = 0.428571, so the margin ratio is 42.86 percent.
  3. Divide the fixed costs by the margin: 24000/15=160024000/15 = 1600 units.
  4. Turn units into money: 1600×35=560001600 \times 35 = 56000, so $56,000 of sales.
  5. Check it the other way, fixed costs over the margin ratio: 24000/(15/35)=5600024000/(15/35) = 56000. Same answer, different route.

You break even at 1,600 units, which is $56,000 of revenue. Every unit after that adds $15 of profit, and every unit short of it leaves $15 of the fixed costs unpaid. The contribution margin is $15 a unit.

Common questions

Can they be the same number?

On a one-product firm they can sit near each other. They are still different objects: one is a year of accounts, the other is a per-unit plan. Treat a 35 percent gross margin as a 35 percent contribution margin and the break-even will not match the books.

Which one goes into break-even?

Contribution margin. Break-even units are fixed costs over price minus variable cost per unit. Gross margin does not know the unit.

Are these the same company?

No. The 35 percent is a wholesale income statement. The $15 is a one-product planning sheet. This page puts them side by side so the formulas are not mashed, not because they share a firm.

Keep reading

This page is educational material, not financial advice. The figures come from the formula shown and assume the inputs you enter hold for the whole term. Your own rate, fees, taxes and timing will differ, so treat the output as arithmetic to check a decision against, not as a recommendation.