Contribution Margin Calculator for eCommerce Marketing
Go beyond ROAS and measure the true profit generated by your marketing efforts. Our Contribution Margin Calculator helps you understand the real bottom-line impact of your ad spend.
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By Joris van Huët, Founder & CEOUpdated 2 min read
Run the numbers for your store: the free contribution margin calculator.
Is Your Marketing Actually Profitable?
ROAS can be a misleading metric. A high ROAS does not necessarily mean you are making money. To understand the true profitability of your marketing, you need to look at your contribution margin. This metric tells you how much profit you are generating from each sale after accounting for variable costs, including the cost of your advertising.
The Contribution Margin Formula
Calculate your marketing contribution margin as follows:
Contribution Margin = (Total Revenue - COGS - Total Ad Spend) / Total Revenue
COGS: Cost of Goods Sold. This includes the cost of the product itself, as well as any transaction fees.
Total Ad Spend: Your total marketing spend over the period.
A positive contribution margin means your marketing is generating a profit. A negative contribution margin means you are losing money on every sale you drive through advertising.
How to Use the Calculator
To calculate your contribution margin, you will need to provide:
Total Revenue: Your total store revenue over a specific period.
Cost of Goods Sold (COGS): Your average COGS as a percentage of revenue.
Total Ad Spend: Your total marketing spend over the same period.
The calculator will then determine your contribution margin and show you how it trends over time. This will give you a clear picture of your marketing profitability.
Calculate Your Contribution Margin
From Revenue to Profit
Focusing on contribution margin forces you to think like a CFO. It shifts the conversation from top-line revenue to bottom-line profit. By refining for contribution margin, you can ensure that your marketing efforts are not just driving sales, but are also building a sustainable, profitable business. You can learn more about our pricing here.
Related Resources
Free ROAS Calculator for ecommerce (With Industry Benchmarks)
Blended ROAS Calculator: Your True Marketing Efficiency
Frequently asked questions
What is a good contribution margin?
This varies widely by industry and business model. If your contribution margin is below 20%, you may need to re-evaluate your pricing, your COGS, or your marketing efficiency. You can learn more about this topic in our resources.How is this different from profit margin?
Profit margin takes into account all your business expenses, including fixed costs like salaries and rent. Contribution margin, on the other hand, only considers the variable costs associated with each sale. This makes it a more direct measure of your marketing profitability.How can I improve my contribution margin?
There are three main levers you can pull: increase your prices, decrease your COGS, or improve your marketing efficiency. By optimizing your ad spend, you can drive more sales for the same amount of money, which will directly improve your contribution margin.
Go deeper: Causal attribution, explained.
Sixty-second versions of these ideas: Causality Engine on YouTube Shorts.
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