Gross margin is the number most businesses quote and the wrong one to run on. The figure that actually governs whether a sale makes money is contribution margin — what is left after every variable cost that hits that specific order. On a DTC sale, that list is longer than most people account for.
The costs that hit every order
Start with cost of goods. Then add platform fees, payment processing, VAT where applicable, pick-and-pack labour, packaging materials, outbound shipping, and a realistic provision for returns. Each is a real cost of fulfilling that order. Subtract all of them from the selling price and you have your true contribution margin — the money available to cover advertising, overheads, and profit.
We routinely see businesses celebrating a 50% gross margin that, after the full variable-cost stack, is contributing closer to 25%. That gap is the difference between a sustainable acquisition strategy and one that quietly loses money at scale.
Why it sets your minimum price and your break-even ROAS
Contribution margin is the input to the two numbers that govern your paid media. It tells you the minimum price you can sell a product at and still cover its variable costs — below which a sale is a loss regardless of volume. And it gives you your break-even ROAS: divide one by your contribution margin, and you have the return below which advertising that product destroys money.
Without this number, you are setting ad targets and minimum prices on guesswork. With it, every decision is anchored to what the product can actually bear.
Calculate it before you scale anything
Scaling a product with a healthy contribution margin compounds profit. Scaling one with a thin or negative contribution margin compounds losses — faster the more you spend. The calculation takes minutes and changes everything downstream, which is why it is the first thing we work out for any product.
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