The products that make you money are the ones with the highest contribution margin, the amount left from each sale after the costs to make and sell that unit. Revenue alone hides the answer. Here is how to find your true margin by product, share overhead fairly, and decide what to grow and what to rethink.
Start with the costs that change every time you make another unit. That means direct materials, the direct labor that touches the product, and variable overhead like the power that runs the machine while it is cutting.
Leave your fixed costs out of this first number. Rent, salaried staff, and insurance do not move when you make one more unit, so folding them in here hides which products are genuinely pulling their weight. You bring overhead back in a moment, on purpose.
What is left from the price of one unit after the variable costs to make and sell it. It is the money each sale contributes toward your fixed overhead and your profit.
Contribution margin is the price of a unit minus the variable cost of that unit. It is the clearest read on whether a product is worth making, because it shows what each sale actually leaves behind.
Revenue can fool you. A product can top your sales report and still be one of your thinnest earners once you see how little stays after its costs. Run one of your products through the calculator and watch the gap between price and what it contributes.
Enter a product's price and the variable cost to make and sell one unit. Nothing is saved or sent anywhere.
Pick a cost driver that reflects how each product uses your plant, then spread overhead by that driver. Machine hours, labor hours, or setups usually track reality far better than splitting overhead evenly across units.
Even spreading is where margins go wrong. A complex, low volume product can tie up a machine for hours and demand its own setup, so charging it the same overhead per unit as a simple high volume product makes the simple one look worse than it is.
Two products can post the same revenue and leave very different amounts behind. Margin is where the truth shows up.
Because volume and margin are not the same thing. A high volume product with a thin margin can fill your schedule while contributing less than a quieter product with a richer one.
The hidden cost is capacity. When a thin margin line runs your machines flat out, it crowds out the products that would have left more behind, so you end up busy and still short on profit.
Turn the numbers into a short list of moves. The goal is to put your capacity behind the products that reward it.
Revenue tells you how busy you are. Margin tells you which products are worth the effort.
It depends on your industry and your overhead, so there is no single right number. Contribution margin is the share of each sale left after the variable costs to make and sell that unit, and it has to cover your fixed overhead and your profit. The useful move is to rank your own products by contribution margin and compare them, rather than chase an outside benchmark. A product well below your others is the one to question on price or cost.
Gross margin subtracts the cost of goods sold, which usually blends in some fixed production costs. Contribution margin subtracts only the variable costs that change with each unit, so it shows what each additional sale truly contributes toward overhead and profit. For deciding which products to grow or rethink, contribution margin is the sharper tool, because it isolates the cost of making one more.
Pick a cost driver that reflects how each product uses your resources, such as machine hours, labor hours, or setups, then spread overhead by that driver. Spreading overhead evenly across all products usually misleads, because a complex low volume product can consume far more machine and setup time than its unit count suggests. Review your driver at least once a year as your product mix changes.
That is the kind of question our team sorts out every day. Our Accounting Clarity® process gives you margin by product you can actually trust, so you know exactly where to push.
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