Guide
“30% profit” can mean two different things. Margin and markup use different denominators.
Cost 1,000, price 1,500, profit 500. Gross margin is 33.3%; markup is 50%. Same profit, different denominator.
The same 500 can be 33.3% or 50%
Gross margin divides profit by the selling price. Markup divides profit by cost. With a cost of 1,000 and price of 1,500, both use the same 500 profit — but not the same denominator.
That is why saying only “profit percentage” invites confusion. Naming the metric is a small habit that prevents a lot of pricing arguments.
A 20% discount is not a 20% margin
A discount measures how far the new price falls from the original price. Margin measures how much profit remains inside the final selling price.
After a sale price is chosen, recalculate the margin using that actual price. Fees, shipping, and marketplace charges can move it again.
A profitable unit does not guarantee a profitable business
A product can make money on every sale while the business is still below break-even. Rent, ads, software, booth fees, and other fixed costs still need to be recovered.
Separating variable cost from fixed cost changes the question from “what is my margin?” to “how many units do I need to sell?” That is often the more useful decision.
Keep the assumptions with the answer
Tax included or excluded? Shipping included? Payment fees counted as variable cost? Two calculations using the same formula are not comparable if those inputs mean different things.
Save the assumptions alongside the result. Future-you will care less about the precise 33.3% than about what was included when it was calculated.