Glossary Term
Return on Ad Spend (ROAS)
ROAS is the revenue generated for every pound or dirham spent on advertising, the cleanest single measure of whether your paid media is actually working.
What Is Return on Ad Spend?
ROAS is calculated as revenue divided by ad spend, usually expressed as a multiple: a 4x ROAS means every £1 of ad spend produced £4 of revenue. It differs from ROI, which factors in cost of goods, fulfilment, and other expenses, so ROAS tells you whether the ad channel is converting and ROI tells you whether the business is profitable on those conversions. What 'good' ROAS looks like depends entirely on margin: a low-margin ecommerce brand needs a much higher ROAS than a high-margin service business to be profitable. Tracking ROAS properly requires honest attribution, knowing which spend produced which revenue, which is harder than it sounds in a multi-touch world.
Why Does Return on Ad Spend Matter for Your Business?
Without a reliable ROAS number, you cannot make confident scaling decisions. Agencies that report only impressions, clicks, or CTR are hiding the only metric that matters. A campaign with terrible click-through rate but 6x ROAS is a winner. A campaign with beautiful click-through rate but 1.2x ROAS is bleeding money. ROAS is the metric you should ask your agency about first.
Return on Ad Spend in Practice
A UK ecommerce supplement brand running Google Ads at a blended 2.1x ROAS appeared healthy on impressions and CTR but was unprofitable after cost of goods. Rebuilding the campaigns around their highest-margin SKUs and pausing the rest lifted ROAS to 4.8x within a month and turned the channel profitable.
Frequently Asked Questions
What's a good ROAS?
+
Depends on margin. Ecommerce typically needs 3x to 5x to be profitable, high-margin services can be profitable at 2x, low-margin retail often needs 6x+. Calculate your own break-even ROAS from your unit economics, then aim above it.
How is ROAS different from ROI?
+
ROAS measures revenue per pound of ad spend. ROI measures profit per pound of total investment, factoring in cost of goods, fulfilment, refunds, and other costs. ROAS tells you if the ad works, ROI tells you if the business works.
How do I track ROAS accurately?
+
Use proper conversion tracking in Google Ads and Meta, pass revenue values from your ecommerce platform, and reconcile against actual orders in your back-office regularly. Don't rely on platform-reported ROAS alone.