What is ROI (Return on Investment)?
ROI, or return on investment, is a key metric you use to measure how much value an investment generates relative to the capital you’ve put into it. The result is expressed as a percentage that shows the ratio of profit to cost. In other words, ROI tells you how effective your investment is—both when evaluating an initiative as a whole and when analyzing its individual components.
You calculate ROI by subtracting the expenses from the profit and then dividing by the expenses. Finally, you multiply the result by 100 to get a percentage. ROI thus directly expresses what portion of your budget actually turns into profit. In marketing, you often use ROI as a metric to measure the effectiveness of, for example, a Google Ads campaign, an SEO initiative, or a video format on social media. ROI therefore becomes part of the strategic process, where you evaluate performance across channels and adjust your efforts to increase profitability.
How do you use ROI?
You use ROI as a management tool to compare results across different investments. When working with digital marketing, for example, you can use ROI to see if you’re getting the most value out of your budget by investing in paid social, keyword advertising, or organic content. By setting clear goals and measuring the results afterward, you can identify which channels generate the highest return per krone and which ones require adjustments.
ROI is therefore not just about reporting results, but about optimizing future decisions. For example, you can use ROI as a basis for decision-making in strategy development, where you prioritize activities based on the impact they have on the business. If you also link your ROI calculations to user data and customer journey insights from SEO or social media, you’ll gain a more nuanced picture of what drives the return—and why.
Why is ROI important?
ROI is important because it provides a common language for measuring results across departments and investment types. When you can express the impact of an initiative as a percentage, it becomes easier to compare efforts, whether you’re measuring an advertising budget, a new web platform, or a rebranding. It also makes it possible to demonstrate the impact of marketing activities to management or clients, as you translate creative decisions into numbers that can be used in budget discussions.
A high ROI means that your efforts generate more value than they cost. It sounds simple, but it’s precisely this simplicity that makes ROI useful in practice. You can quickly see whether a project is performing well—or whether you need to reevaluate your strategy. Conversely, a negative ROI indicates that the project isn’t yielding a sufficient return and that you should analyze the reasons why. In marketing, for example, this could mean that a campaign didn’t reach the target audience or that the ads were displayed on channels with too low a conversion rate.
What types and varieties are available?
There are several ways to measure ROI, depending on the context. Marketing ROI (MROI) focuses exclusively on marketing activities and compares the benefits of, for example, campaigns or content production to their costs. This allows you to isolate the value of different initiatives and choose the ones that yield the highest return. Another variant, Return on Costs (ROC), measures the return directly against the costs and is typically used in broader business contexts. If you dig deeper, you can also analyze ROI through related metrics such as Return on Assets (ROA), which shows how effectively the company utilizes its assets.
In practice, you choose the variant depending on whether you want to measure the results of individual campaigns, an overall channel strategy, or the company’s investment policy. In marketing, MROI typically makes the most sense because it isolates the portion of profit that can be attributed to marketing.
How do you work with ROI in practice?
When working with ROI in practice, a lot of it comes down to defining what you’re measuring from the start. You need to know both the cost of the investment and the value of the return. This is especially true in digital marketing, where you often measure data from multiple sources—such as ad platforms, web analytics, and CRM systems. For example, if you’re running a social media campaign, you can pull revenue figures from your online store and link them directly to the clicks and conversions the campaign has generated. The total profit minus the campaign costs gives you your ROI.
A simplified example of the calculation looks like this:
Let’s say you spend 20,000 kroner on a video ad and generate a profit of 170,000 kroner. You calculate the ROI as follows: ((170,000 – 20,000) / 20,000) × 100 = 750%. This means you’ve generated 7.5 kroner in return for every kroner invested. You can use this insight to allocate budgets moving forward—perhaps by increasing video production, testing new ad formats, or adjusting your content strategy.
However, you should always take the time horizon into account. ROI does not measure how long it takes for an investment to pay off. A short-term campaign may yield a high ROI in the short term, while brand building or organic SEO can provide a lower but more stable return over the long term. It is therefore important to tailor your analysis to the specific purpose and view ROI as just one of several factors in your decision-making process—alongside KPIs such as conversion rate, engagement, and customer lifetime value.
What should you keep in mind?
When using ROI, keep in mind that the measurement is only as accurate as the data on which it is based. You should therefore ensure consistent data sources and uniform calculation methods so that your comparisons hold up. At the same time, you should be aware that ROI doesn’t show the whole picture. It doesn’t account for time lags, external factors, or long-term benefits such as brand value and customer loyalty.
In your marketing strategy, it is therefore beneficial to combine ROI with qualitative metrics so that you don’t focus solely on short-term returns. This way, you’ll get a more balanced assessment of your overall performance and can make decisions that strengthen both your financial position now and your market positioning in the long term.
