Sales figures get the attention, but margin decides whether a business can cover its costs and keep going. Two businesses with identical revenue can be in completely different positions depending on how much of each sale they keep. This lesson introduces margin, shows you how to calculate it and explains why every pricing decision in this course comes back to it.
Revenue, cost and what you keep
Every sale has a price and a set of costs attached to delivering it. The difference between the two is what you keep from that sale to pay for everything else: rent, software, salaries and, eventually, profit. Margin expresses that difference as a percentage of the price. It turns a vague sense of doing well into a number you can compare across products, months and decisions.
The basic margin formula
The core formula is simple. Subtract the direct cost of a sale from its price to get gross profit, then divide gross profit by the price. If something sells for 40 dollars and costs 16 dollars to produce and deliver, gross profit is 24 dollars, and margin is 24 divided by 40, or 60 percent. Always divide by price, not cost; that distinction becomes important in the next lesson.
Why margin beats revenue as a guide
Revenue tells you how much activity you have. Margin tells you how much of that activity is useful. A product with high sales and a thin margin may consume time and cash while contributing little. A smaller product with a healthy margin may quietly fund the business. When you set prices, run promotions or choose what to sell, margin shows the real effect in a way revenue cannot.
Worked example
Imagine Maya runs a bakery and sells two cakes. The chocolate cake sells for 30 dollars with 18 dollars of direct cost, a 40 percent margin. The lemon cake sells for 24 dollars with 9 dollars of direct cost, a 62.5 percent margin. The cheaper cake keeps more dollars and a larger share of each sale, which changes how Maya might promote them.
Action step
Choose three things you sell or plan to sell. For each, write the price and your best estimate of direct cost per unit. Calculate gross profit and margin percentage. Keep these figures handy, because you will refine them throughout the course.
Key takeaways
- Margin is the share of each sale price you keep.
- Calculate margin by dividing gross profit by price.
- Margin reveals what revenue alone hides.
Educational content only — not financial, tax, or investment advice. Consult a qualified professional for your own situation.