ROAS is influenced by profit margins, operating expenses, and the overall health of the business. While there’s no “right” answer, a common ROAS benchmark is a 4:1 ratio — $4 revenue to $1 in ad spend. Start-ups may require higher margins, while online stores committed to growth can afford higher advertising costs. Some businesses require a ROAS of 10:1 in order to stay profitable, and others can grow substantially at just 3:1.