Return on Ad Spend (ROAS)
The revenue generated for every dollar spent on advertising.
Definition
ROAS = Revenue from Ads / Ad Spend. A ROAS of 4x means you generate $4 in revenue for every $1 spent on ads. Unlike ROI, ROAS only considers ad spend (not total costs). It's the primary metric for evaluating paid acquisition efficiency. Acceptable ROAS varies by business model: e-commerce typically needs 3-5x, SaaS can accept 1-2x because of recurring revenue.
ROAS should be evaluated at the cohort level and over time. Day-1 ROAS might be 2x, but 90-day ROAS could be 6x as customers make repeat purchases or expand their subscriptions.
Why it matters for founders
ROAS determines whether paid advertising is a viable growth channel. If your ROAS is below your break-even threshold, scaling ad spend means scaling losses. Founders need to know their target ROAS before investing in paid channels.
Example
Casper mattresses needed a ROAS above 3x to break even on Facebook Ads. They tested dozens of creative variations, finding that user-generated content ads delivered 5.2x ROAS versus 2.1x for branded creative. This insight let them scale Facebook spend profitably.
How Foundra helps
Foundra's validation process helps you establish baseline conversion metrics before investing in paid acquisition, so you can project ROAS realistically.
Start your free trial→Related free tools
Related terms
Cost Per Acquisition (CPA)
The cost of acquiring one converting customer through a specific marketing channel or campaign.
Customer Acquisition Cost (CAC)
The total cost to acquire one new customer.
Lifetime Value (LTV)
The total revenue a customer generates over their entire relationship with your business.
Unit Economics
The revenue and costs associated with a single unit of your business (usually one customer).