What is ROAS?
Also known as: Return on Ad Spend
Return on Ad Spend — the revenue generated for every dollar spent on advertising. The most-cited efficiency metric in performance marketing.
ROAS = Revenue Attributable to Ads ÷ Ad SpendThe detailed definition
ROAS measures revenue per dollar of advertising spend over a defined attribution window. A ROAS of 4.0 means $4 of revenue for every $1 spent on ads. The simplicity of the formula hides three trapdoors: the choice of attribution model (different windows credit different campaigns), the definition of ad spend (does it include creator fees and agency markup?), and the comparison against margin (what counts as a 'good' ROAS depends entirely on your gross margin). Break-even ROAS = 1 ÷ Gross Margin. A 70%-margin DTC brand breaks even at ROAS 1.43, while a 30%-margin retailer needs ROAS 3.33 just to recover COGS. Use ROAS for daily tactical decisions because every ad platform reports it natively; pair with POAS for monthly strategic decisions where margin variation matters.
Frequently asked about ROAS
›What is a good ROAS?
It depends on your gross margin. Break-even ROAS = 1 ÷ gross margin. A 60%-margin DTC brand breaks even at ROAS 1.67; a 30%-margin retailer needs ROAS 3.33+. Above break-even, layer in your target net profit margin. Industry benchmarks: ecommerce 2.5–4.0, B2B SaaS 3.0–6.0, high-LTV B2B 8.0+.
›Is ROAS the same as ROI?
No. ROAS measures revenue per dollar of ad spend (Revenue ÷ Spend). ROI measures profit per dollar of total investment ((Gain – Cost) ÷ Cost). ROAS ignores everything except revenue and spend; ROI accounts for COGS, operating costs, and other inputs. ROAS is faster to compute and tactically useful; ROI is strategically more honest.
›How is ROAS calculated for multi-channel campaigns?
Sum revenue from each channel and divide by total ad spend across channels, using a consistent attribution window. The trap: each platform's reported ROAS often double-counts conversions shared with other platforms. Reconcile platform-claimed revenue against your backend (Shopify, Stripe) for a defensible cross-platform ROAS.
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