Unit Economics

Contribution Margin

Turn one sale into a repeatable formula, and know exactly how many sales it takes to cover your costs.

  • Intermediate
  • 6 min total
  • 11 chapters

What decision this helps you make: Whether to change your price, cut a variable cost, or sell more volume to reach profit.

What this topic is

Contribution margin is what one sale leaves behind after its own variable costs: the money left over to cover fixed costs like rent and salaries, and then to become profit.

Why it matters

It turns "am I making money?" into a formula. It tells you exactly how many sales cover your fixed costs (break-even) and how much each extra sale is really worth.

Who should learn it

Any owner or founder setting prices, weighing a discount, or trying to work out how much volume it takes to finally turn a profit.

What you will understand

  • Separate the costs that grow with each sale from the ones that do not
  • Calculate how many units it takes just to break even
  • See why a small price change moves profit more than a big volume change
  • Compare a low-margin, high-volume business to a high-margin one

Prerequisites

Common misconception

"A higher price always means more profit." Not if it drops your sales below break-even. Profit is contribution margin times volume, so price and volume have to be judged together.