Marketing ROI, ROAS & CAC Calculator
Measure campaign economics using revenue, gross profit, advertising cost, leads, and acquired customers—without confusing ROAS with profit.
Calculation method
This marketing calculator and its accompanying guides are designed to serve as helpful analytical tools for internal planning. Actual campaign performance may vary over time based on shifts in market dynamics, attribution models, and operational overhead.
Connecting Marketing Numbers to Reality
Marketing numbers can look impressive until you connect them to the money actually spent. A campaign may generate thousands of dollars in sales, but that does not automatically mean it was profitable. Your advertising and marketing costs, along with the number of customers acquired, provide important context.
The **Marketing ROI, ROAS & CAC Calculator** helps you evaluate these numbers in one place. Enter your marketing investment, advertising spend, revenue, and customer acquisition information to calculate marketing ROI, ROAS, and customer acquisition cost (CAC).
These three metrics answer different questions:
- ROI: Did the marketing investment generate a return after considering the relevant costs?
- ROAS: How much revenue was generated for each dollar spent on advertising?
- CAC: How much did it cost to acquire each new customer?
Using the metrics together can give you a clearer view of marketing performance than looking at revenue or ad spend alone.
What Does the Calculator Do?
This calculator combines three commonly used marketing performance calculations:
- Marketing ROI: Measures the return generated from a marketing investment relative to the cost of that investment, helping answer whether enough money was made to justify the spend.
- ROAS (Return on Ad Spend): Compares revenue attributed to advertising with the amount spent on advertising, answering how much revenue was generated for every dollar spent.
- CAC (Customer Acquisition Cost): Measures the average cost required to acquire a new customer, answering how much it cost to gain each customer.
What Information Do You Need?
Common inputs required for these metrics include:
- Marketing Investment: The total amount invested in the marketing activity you want to evaluate.
- Advertising Spend: The amount spent specifically on paid advertising when calculating ROAS.
- Revenue: The revenue attributed to the campaign or marketing activity being analyzed.
- Number of New Customers: The number of customers acquired during the period or from the campaign.
- Additional Marketing Costs: Costs beyond advertising, such as agency fees, creative production, software, or other expenses included consistently.
Core Formulas & Calculations
(Marketing Return − Marketing Investment) ÷ Marketing Investment × 100
Attributed Revenue ÷ Advertising Spend
Customer Acquisition Costs ÷ Number of New Customers
ROI vs. ROAS vs. CAC
Although ROI, ROAS, and CAC are related, they should not be treated as interchangeable.
| Metric | What It Measures | Basic Question |
|---|---|---|
| ROI | Return relative to investment | Was the investment profitable? |
| ROAS | Revenue relative to ad spend | How much revenue did advertising generate? |
| CAC | Acquisition cost per customer | How much did each customer cost to acquire? |
A Simple Example Using All Three Metrics
Suppose a company spends $8,000 on advertising, $2,000 on other included marketing costs, generates $30,000 in attributed revenue, and acquires 200 new customers:
- ROAS: $30,000 ÷ $8,000 = 3.75 (or 3.75:1)
- CAC: If the acquisition cost being measured is $10,000, $10,000 ÷ 200 = $50 per customer
- Marketing ROI: If the total marketing investment is $10,000, ($30,000 − $10,000) ÷ $10,000 × 100 = 200%
These numbers are not contradictory; they answer different questions about the same marketing activity.
Common Mistakes to Avoid
- Mixing Revenue and Profit: ROAS is based on revenue, not necessarily profit, meaning a campaign can produce strong revenue with limited profitability after other costs.
- Including Different Costs in Different Comparisons: Inconsistent cost inclusions across campaigns make comparisons unmeaningful.
- Using Inconsistent Attribution: Varying revenue attribution methods can significantly affect ROAS and ROI results.
- Ignoring New Customer Definitions: CAC depends heavily on what counts as a new customer for the period being analyzed.
- Comparing Metrics Without Context: A single figure does not explain every aspect of marketing performance without considering customer quality, margins, and sales cycles.
Frequently Asked Questions
What is a Marketing ROI Calculator?
A Marketing ROI Calculator estimates the return generated from a marketing investment relative to the investment cost, helping determine whether the return exceeds the included costs.
How do I calculate ROAS?
The basic ROAS formula is attributed revenue divided by advertising spend (e.g., $20,000 in revenue from $5,000 in ad spend produces a ROAS of 4, or 4:1).
How do I calculate CAC?
The basic CAC formula is customer acquisition costs divided by the number of new customers acquired (e.g., spending $5,000 to acquire 100 customers yields a CAC of $50).
What is the difference between ROI and ROAS?
ROAS compares attributed revenue specifically with advertising spend, while ROI evaluates the return relative to a broader investment cost base depending on how it is defined.
Is a lower CAC always better?
Not necessarily. While lower CAC can be attractive, the quality and economics of the customers acquired also matter and should be evaluated alongside generated revenue or margins.
