PLAIN-LANGUAGE DEFINITION
ROAS
Return on ad spend is attributed revenue divided by ad spend.
IN PRACTICE
An example
Revenue of 1500 from spend of 500 produces reported ROAS of 3.
What this does not tell you
ROAS omits product costs and depends on attribution; it is not net profit.
Use the term precisely
When you use this term in a brief or report, include the relevant source, scope and assumptions. An example explains the concept; it is not a benchmark or a promise of results.