Ecommerce Metrics · Updated June 2026
ROAS (return on ad spend) is revenue generated per dollar of advertising. A 4× ROAS means $4 in revenue for every $1 spent. Break-even ROAS depends on gross margin: at 50% margin, you need at least 2× ROAS to avoid losing money.
ROAS ignores organic and repeat revenue, so it systematically undervalues channels like SEO and email that compound over time. Many profitable stores blend paid acquisition with owned channels precisely because ROAS-only thinking caps growth.
Conversion rate is the percentage of website visitors who complete a purchase. It is calculated as orders divided by total sessions, multiplied by 100. A typical Shopify store converts 1–3% of sessions; top performers exceed 4%.
SEO (search engine optimization) is the practice of improving a website so it earns more visibility in organic search results. For ecommerce, SEO spans technical health, on-page content, site structure, and authority building — and it compounds, unlike paid ads.