What Is ROAS?
ROAS (return on ad spend) measures how much revenue a campaign generates for every dollar spent on advertising. It's expressed as a ratio or multiplier — a ROAS of 5x means $5 of revenue came back for every $1 spent — making it one of the most direct ways to judge whether a campaign is paying for itself.
Unlike CPC or CPM, which describe cost of delivery, ROAS connects spend to actual revenue outcome, which is why it's the headline metric for most e-commerce and performance marketing campaigns.
ROAS Formula
Divide revenue generated by the ad by total ad spend.
ROAS = Revenue ÷ Ad Spend
Worked Example
A campaign spends $1,200 on ads and generates $6,000 in attributed revenue.
ROAS = $6,000 ÷ $1,200 = 5x
Rearranged, the formula solves for revenue or ad spend instead, which is what the other two modes above do:
Revenue = ROAS × Ad Spend
Ad Spend = Revenue ÷ ROAS
Want cost per individual sale instead of a ratio? The CPA calculator gives you that same campaign's cost per acquisition directly.
What Affects ROAS?
- Average order value — higher-value purchases lift revenue without necessarily increasing ad spend.
- Conversion rate — more of the traffic an ad drives converting into a sale raises ROAS directly.
- CPC and CPM — cheaper traffic or reach for the same conversion rate improves ROAS by lowering the denominator.
- Attribution window and model — a longer attribution window or a different model (last-click vs. multi-touch) can credit a campaign with more or less revenue for the same spend.
- Audience and offer fit — better-matched audiences and stronger offers convert more efficiently at the same cost.
ROAS Calculator FAQ
How is ROAS calculated?
ROAS is calculated by dividing revenue generated by ad spend: ROAS = Revenue ÷ Ad Spend. A ROAS of 4 (often written 4x or 400%) means $4 in revenue for every $1 spent on ads.
What's a good ROAS?
A "good" ROAS depends on your margins — a 4x ROAS can be excellent for a low-margin business and barely break-even for a high-cost-of-goods one. Calculate your break-even ROAS from your margin first, then judge campaign ROAS against that, not a generic benchmark.
What's the difference between ROAS and ROI?
ROAS compares revenue to ad spend only (Revenue ÷ Ad Spend). ROI compares net profit to total investment, including cost of goods and other expenses beyond media spend: ROI = (Revenue − Total Cost) ÷ Total Cost. ROAS is simpler to track per-campaign; ROI reflects actual profitability.
How do you calculate break-even ROAS?
Break-even ROAS equals 1 ÷ profit margin (as a decimal). For example, at a 25% margin, break-even ROAS is 1 ÷ 0.25 = 4x — below that, ad spend costs more than the profit it generates.