Marketing ROI Calculator Guide
Review campaign efficiency with ROI, ROAS, and acquisition cost before you increase spend.
What This Calculator Measures
This tool compares revenue generated from marketing against the cost of the campaign and the profitability of what was sold. It helps answer a more useful question than “did the ad work?” by asking “did the ad produce profitable business?”
Inputs You Need
You will normally enter marketing spend, attributed revenue, average profit margin, and customer acquisition volume. The margin input matters because a campaign can look strong on revenue while still being weak after cost of delivery and overhead.
Core Formulas
ROAS = Revenue / Ad Spend, Gross Profit from Campaign = Revenue x Margin %, and ROI = (Profit - Ad Spend) / Ad Spend. CPA is marketing spend divided by customers acquired.
How to Interpret the Result
ROAS tells you efficiency at the revenue level. ROI tells you whether the campaign actually created profit. A campaign can show healthy ROAS while still failing at ROI if product margins are thin or fulfillment costs are high.
Worked Example
If you spend $2,000, generate $10,000 in revenue, and operate at a 40% margin, gross profit is $4,000. Subtract the $2,000 campaign cost and the campaign leaves $2,000 profit. ROI is 100% and ROAS is 5:1.
Common Mistakes
Common errors include counting leads instead of customers, over-attributing revenue to one channel, or ignoring the business margin. The cleanest practice is to review both revenue efficiency and profit efficiency together.
Open the Calculator
Use the calculator when reviewing paid search, social ads, or any channel where spend should be justified by outcomes.