There are three camps of physical product founders when it comes to their margins.

Camp one doesn’t track anything and is just hoping for the best (good luck surviving AI).

Camp two tracks gross margin and thinks that’s enough (good, but not good enough).

Camp three tracks contribution margin, the actual number that tells you how much you keep after every variable cost is accounted for.

In this post I’m going to walk you through why camp #3 will help you scale your business more profitably, and the mistakes most people make when calculating their margins.

The Difference Between Gross Margin and Contribution Margin

Gross margin typically covers your product costs like cost of goods sold, and maybe some basic fulfillment. It’s the number that shows up cleanly in most reports and feels satisfying to look at.

But it’s extremely incomplete.

Contribution margin (CM), on the other hand, includes EVERY variable cost associated with delivering your product.

That means your CM calculation needs to include:

Gross margin misses most of that list. So if you’re making decisions based on gross margin, you’re making decisions based on the wrong data, and therefore making bad decisions.

Blended Contribution Margin vs Unit Economics

The mistake most people make is tracking contribution margin (or any margin) at the brand/company level rather than at the SKU level.

They look at total revenue, subtract total variable costs, and get an overall percentage. And that DOES tell you something. It’s valuable. It tells you the overall health of the company.

But it’s NOT enough to make product-level decisions.

If your overall contribution margin is 50%, that average might be masking products at 75% and products at negative 10%. Without the SKU-level breakdown, you have no idea which ones to scale, which to cut, and which to reprice.

Channel matters just as much. Your contribution margin on Meta is going to look very different from your contribution margin on Amazon, because Amazon stacks fees that don’t exist on other channels. FBA fees, storage, returns, and the platform percentage. If you’re running the same margin assumption across all channels, you’re probably overstating what Amazon is contributing.

The same logic applies to bundles, different price points, and wholesale versus direct. Every variation needs its own calculation, because each one has a different cost structure.

Why Pricing Is the Most Underused Lever

There’s a McKinsey study I reference constantly because the numbers are kind of insane:

On average, for every 1% increase in price, you can expect an 8% increase in profit.

So if you raise prices across your product line by 10%, you can realistically expect something in the range of an 80% improvement in profit, assuming volume holds reasonably steady.

Now to be fair, when I personally do this, it’s typically more like 5-6%, not 8%.

Either way, it gives you MASSIVE leverage.

Most founders never test this because they’re terrified their conversion rates will drop. But when you improve your marketing, when you do a better job articulating the real problem your product solves and the real outcome it delivers, you can raise prices without losing conversions. I’ve watched it happen. I’ve made it happen. I’ve heard stories of it happening. And in some cases, conversion rates went UP after a price increase because the higher price reinforced the quality perception.

And even if volume dips slightly, the math often still works. A 10% price increase which causes a 50% increase in profit but a 5% volume drop is (typically) still a net win on profit.

The key is to do the test and model it out. Because in this scenario for example, you’d have to model out what that means to get 5% less volume, since LTV is such a contributing factor to long-term profit.

How to Calculate This

Open a spreadsheet, pick your main product, and write down your selling price at the top.

Then go through every variable cost line by line. Don’t estimate. Pull the actual numbers from your invoices, your processor statements, your fulfillment reports, add everything up, and divide total variable costs by selling price. Subtract from 100%.

That’s your real contribution margin.

Then compare it to whatever number you had in your head before you ran the math. That gap is your starting point.

Once you have the real number, do the same for your other SKUs and channels. It takes longer the first time, but each additional product usually takes a few minutes because the structure is the same and you’re mostly tweaking the inputs.

When you have all of it mapped out, you’ll be able to see immediately which products are working for you, which channels are worth scaling, which SKUs are quietly bleeding you, and where you have room to push on pricing.

That data becomes your decision filter for everything. Which products to put ad spend behind. What your real Allowable Customer Acquisition Cost (ACAC) is. Whether a promotion makes financial sense before you run it. And so on and so forth.

You can’t make those calls accurately without this foundation. And right now, if you’re working off gross margin or a rough estimate, you’re flying without instruments.

Fix that first. Everything else gets easier once you can see what you’re working with.

If you want a framework for doing this across your entire business, not just contribution margin but all five profit levers, my book The Scalable Profit Model walks through the whole system. You can grab it at scaleadvisors.com/book.

And if you’d rather work through it directly, reach out. That’s what I do.