The coverage ratio is the key figure that determines whether your growth actually translates into profit or just more work for the same earnings. The article explains the difference between coverage ratio, contribution margin, and gross profit, and why consistent calculation is crucial for making better decisions across products, campaigns, and channels. At the same time, it shows how conversion and speed optimization can enhance your coverage ratio by getting more out of the traffic you are already paying for.
What is coverage ratio, and why does it matter?
The contribution margin tells you what portion of your revenue remains after your variable costs have been paid. This is the money that needs to cover fixed costs such as salaries, rent, platform fees, agency assistance, and ultimately your profit. Once you know your contribution margin, you can assess whether a campaign is truly profitable and whether an increase in revenue also leads to an increase in earnings.
If you can't explain your coverage rate without looking at a spreadsheet first, you're probably managing your webshop based on gut feeling. This makes it difficult to prioritize correctly, especially when you have to choose between ramping up marketing, lowering prices, or investing in optimizations.
Coverage rate calculation and formula
The coverage rate is typically calculated as the contribution margin as a percentage of revenue. The most important thing is not to memorize the formula, but to use it consistently so you can compare products, campaigns, and channels on the same basis.
Coverage rate (%) = (Revenue - Variable costs) / Revenue * 100
When working with numbers in e-commerce, it often makes sense to think per order and per product line. This way, you can see where you are making money and where you are effectively paying for growth.
What should be included in the calculation?
Start by defining your variable costs per order, so you don't mix fixed and variable costs together. Once the definitions are in place, the numbers will be useful, especially when you need to assess whether a campaign is good or if it just feels good because revenue is increasing.
Typical variable costs can include, for example:
- Cost of goods sold (COGS) and consumption of goods
- Transaction and payment fees
- Picking, packing, and variable storage costs (if they follow order volume)
- Shipping, if you pay for it in full or in part per order.
- Returns and exchanges, if you allocate them as an average cost per order.
The crucial thing is to choose a model that you can repeat month after month. Consistency beats perfection because it allows you to see progress and make decisions on a stable basis.
Coverage ratio vs. contribution margin
Contribution margin is the amount in kroner. Contribution rate is the percentage. Both are important, but they are used for different decisions. The contribution margin helps you see how many kroner you have left per sale, while the contribution rate allows for comparisons across different scenarios, even when revenue fluctuates.
If you only look at revenue, you can easily celebrate growth that is essentially just more work for the same money. The contribution margin is the key figure that makes it clear when something isn't adding up.
Gross profit and gross margin in e-commerce
Many use gross profit and gross margin as if they mean the same as contribution margin. They are close, but the difference depends on how you categorize costs. Therefore, there is not one correct version that fits all, but there is a useful version, namely the one you can repeat and use to manage the business.
If you want to work more seriously with e-commerce key figures, it often makes sense to connect the coverage rate with the customer journey and performance. This makes the finances more action-oriented, as you can see which improvements boost earnings per visit, per order, and per customer.
Conversion optimization and coverage rate
You can improve coverage in two main ways. Either you increase the revenue per order, or you lower the cost of acquiring the order. Conversion optimization is about both, and it involves ongoing improvements based on data, tests, and prioritization, not a one-time project.
In practice, conversion optimization can affect the profit margin by:
- Increase the conversion rate so you get more orders from the same traffic.
- Increase average order value (AOV) with relevant bundles, upselling, and cross-selling.
- Reduce discount dependence by improving the product and purchasing experience.
- Reduce waste in advertising, as a better post-click experience often leads to better efficiency.
Speed optimization, SEO, and better utilization of marketing funds
A slow site combined with high traffic and low coverage is a classic challenge. Speed affects the user experience and influences how much you get out of both paid and organic traffic. When the site becomes faster, you can often improve the conversion rate and reduce waste, as fewer people drop off before they even see the product.
Therefore, speed is not just a technical discipline. It is also an economic discipline, because every second can affect how effectively your marketing dollars are converted into contribution margin.
A simple rule of thumb
If you pay for traffic but do not invest in the experience after the click, you are paying to be disappointed faster. This affects both the conversion rate and profit margin because you are using the same budget for fewer orders.
If you need help gaining an overview of your coverage rate and finding the most effective optimizations, you can contact us at contact@mercive.com or call at+45 61 60 29 83.