To calculate ROAS, divide revenue attributed to advertising by the cost of those ads. The formula is simple, but the answer is only useful when the spend, revenue, attribution method, and date range match.
You can use our free ROAS Calculator to calculate ROAS, CPC, CPA, conversion rate, and simple campaign profit. You can also use the same formula manually in a spreadsheet or report.
Quick answer: the ROAS formula
ROAS = Revenue from ads / Ad spend
If a campaign costs $500 and generates $2,000 in attributed revenue, divide $2,000 by $500. The result is 4, normally written as 4x ROAS. This means the campaign produced four dollars in revenue for every dollar spent on advertising.
How to calculate ROAS percentage
Some platforms and reports display ROAS as a percentage instead of a multiple. Multiply the ROAS result by 100 to convert it.
ROAS percentage = ROAS x 100
A 4x ROAS equals 400 percent. A 2.5x ROAS equals 250 percent. These formats describe the same result, so choose one format and label it clearly in your report.
What numbers do you need?
You need two core inputs: ad spend and revenue attributed to those ads. Use both numbers from the same campaign and reporting period. If you are combining channels, add the spend and attributed revenue from each channel consistently.
Clicks and conversions are not part of the basic formula, but they help explain performance. They allow you to review CPC, CPA, and conversion rate alongside ROAS instead of judging revenue efficiency in isolation.
How to calculate ROAS step by step
Step 1: Choose the campaign and date range
Select one campaign, ad set, channel, or account and define the reporting period. Mixing unrelated campaigns can hide weak performance.
Step 2: Find total ad spend
Use the exact cost reported by the advertising platform for the selected period. Keep media spend separate from product and operating costs unless your report explicitly uses a wider formula.
Step 3: Find attributed revenue
Use tracked ecommerce sales, lead value, or other revenue connected to the campaign. Check the attribution window so the revenue is measured consistently.
Step 4: Divide revenue by spend
Divide attributed revenue by ad spend. A result of 3 means the campaign generated three dollars in revenue for each advertising dollar.
Step 5: Interpret the result in context
Compare the result with gross margin, conversion volume, customer acquisition cost, refunds, and the campaign goal. ROAS measures revenue efficiency, not final business profit.
ROAS calculation example
A brand spends $1,200 on a paid search campaign and attributes $5,400 in sales to that campaign.
$5,400 / $1,200 = 4.5x ROAS
The percentage version is 450 percent. The campaign returned $4.50 in revenue for every dollar of ad spend. Whether that result is profitable still depends on product cost, fulfillment, fees, and other expenses.
Blended ROAS example
Suppose a business spends $800 on Google Ads and $400 on paid social, for total ad spend of $1,200. The channels produce $3,600 in attributed revenue. Dividing $3,600 by $1,200 gives a blended ROAS of 3x.
A blended result is useful for an overall view, but channel-level results are still needed to identify which campaigns are driving performance.
Common ROAS mistakes
- Using total store revenue instead of revenue attributed to ads.
- Comparing spend and revenue from different date ranges.
- Mixing attribution models without explaining the difference.
- Using clicks or conversions in place of revenue.
- Treating ROAS as profit without considering product and operating costs.
- Scaling a campaign based on a high result from very little data.
- Reporting a percentage and a multiple as though they were different metrics.
FAQs
What is the easiest way to calculate ROAS?
Divide revenue from ads by ad spend. A calculator completes the same formula instantly when you enter the campaign values.
How do I convert ROAS to a percentage?
Multiply the ROAS multiple by 100. For example, 3.5x ROAS equals 350 percent.
Can ROAS be below 1?
Yes. A result below 1 means attributed revenue is lower than ad spend before any other costs are considered.
Is ROAS the same as profit?
No. ROAS compares advertising revenue with ad spend. It does not subtract product cost, shipping, salaries, software, or other business expenses.
Conclusion
Learning how to calculate ROAS gives you a consistent way to review advertising efficiency. Keep the formula simple, use matching data, and interpret the result alongside margin, volume, and tracking quality before changing the budget.
CTA: Try our free ROAS Calculator.