What is ROI? Return on Investment — Formula, Examples, and How to Analyze
<p>ROI (Return on Investment) is the metric that calculates the profit generated in relation to the amount invested in a marketing action or business. Formula: (Profit − Investment) / Investment × 100.</p>
ROI (Return on Investment) is the metric that calculates the profit generated in relation to the amount invested in an action, campaign, or project. A positive ROI means that the initiative generated more revenue than it cost; a negative ROI indicates a loss.
What is ROI and why every company needs to measure it
ROI is the acronym in English for Return on Investment. It is one of the most used financial metrics in the business world because it directly answers the question that every entrepreneur asks: Was what I spent worth it?
In digital marketing, ROI is calculated for each channel — SEO, Google Ads, Facebook Ads, email marketing, social media — allowing comparison of which strategies truly bring financial returns and which need to be adjusted or abandoned.
The big difference between companies that grow with marketing and those that waste budget lies exactly here: those that grow measure the ROI of every penny invested and make decisions based on data, not intuition.
ROI Formula
ROI = (Profit Obtained − Amount Invested) / Amount Invested × 100
Where:
- Profit Obtained = Revenue generated − cost of products/services sold
- Amount Invested = Spending on the campaign/action (agency + media + production)
Practical examples of ROI in digital marketing
Example 1 — Google Ads
A store in Joinville invested R$1,000 in Google Ads in one month. The campaign generated R$8,000 in sales, with a product cost of R$1,000.
- Profit = R$8,000 − R$1,000 − R$1,000 = R$6,000
- ROI = R$6,000 / R$1,000 × 100 = 600%
Example 2 — SEO
A company in SC invested R$1,500/month in SEO for 6 months (R$9,000 total). After 12 months, organic traffic generated R$15,000 in sales with a 60% margin.
- Profit = R$15,000 × 60% − R$9,000 = R$3,000
- ROI = R$3,000 / R$9,000 × 100 = 33.33% per year
Example 3 — Email Marketing
The company invested R$200/month in the platform + creation. It reactivated customers generating an additional R$1,400 with a 70% margin.
- Profit = R$1,400 × 70% − R$200 = R$680
- ROI = R$680 / R$200 × 100 = 340%
What is a good ROI in digital marketing?
| Channel | Average Market ROI |
|---|---|
| Email Marketing | 3,600% (R$36 for every R$1) |
| SEO | 200–500% per year |
| Google Ads | 100–400% |
| Facebook/Meta Ads | 50–300% |
Why measuring ROI is essential for your business
- Budget prioritization: with ROI calculated, you know where to double the investment and where to cut
- Spending justification: presenting ROI transforms marketing from a cost into an investment
- Comparison between channels: which brings more return — SEO or Ads? ROI answers without guesswork
- Predictability: historical ROI allows for projecting growth with confidence
- Negotiation with suppliers: demand ROI from every agency — those who do not measure do not manage
ROI vs. ROAS — what’s the difference?
| Metric | Formula | When to use |
|---|---|---|
| ROI | (Profit − Investment) / Investment × 100 | Complete financial view of the business |
| ROAS | Revenue / Ad Spend | Specific for paid campaigns |
ROAS ignores the cost of the product and the profit margin — that’s why ROI is more comprehensive for business decisions.
Related terms
- KPI — Key Performance Indicators — define KPIs to measure ROI
- ROAS — Return on Ad Spend — variant of ROI for ads
- CPA — Cost per Acquisition — how much each conversion costs
- Conversion Rate — the divisor of ROI
- Sales Funnel — where ROI is generated