Contribution Margin

Contribution margin is what one sale actually leaves in your hand after the costs that come with that sale, the product, the shipping, the fees. It is the real pot your ads get to spend from.

You look at a 2,000 rupee sale and feel good, but that number was never yours to keep. Take out what the product cost you, the shipping, and the payment fees, and what is left is the contribution margin: the money that one order actually contributes toward everything else, your ads, your rent, your profit. It is not your price and it is not your net profit either, it sits in between. It is revenue minus the variable costs of making that one particular sale happen.

This matters because your whole ad budget lives inside this number, not inside your revenue. Your breakeven ROAS comes from it, how much you can afford to pay for a customer comes from it, and two shops with identical revenue but different margins are quietly running completely different businesses. Work off revenue and everything downstream is built on a number you never actually got to keep.

Contribution margin only counts the costs that move with each sale. It does not include your rent, your salaries, or your software, the fixed costs that exist whether you sell one unit or a thousand. So a positive contribution margin means the sale helps, not that the business is in profit. You still have to clear the fixed costs on top of it before anything is truly yours.

Revenue is the number you announce; contribution margin is the number your ads are actually allowed to spend.