Business Glossary
What Is Channel ROAS?
Channel ROAS measures the return on advertising spend for each individual marketing channel — Google Ads, Meta, email, affiliates, and so on. It enables UK businesses to allocate budget to channels generating the best commercial return rather than spreading spend uniformly.
The Formula
Channel ROAS = Revenue Attributed to Channel ÷ Ad Spend on Channel
Worked Example — UK SME
A UK e-commerce business: Google Ads £3,200, revenue £14,400 (ROAS 4.5x). Meta Ads £2,800, revenue £7,280 (ROAS 2.6x). Email £400, revenue £5,600 (ROAS 14x). Email generates 5x the ROAS of Google with one-eighth of the spend — a clear reallocation opportunity.
UK Benchmark
📊 Most UK SMEs have 3–8x ROAS variation between their best and worst channels. Reallocating budget from worst to best performers, without increasing total spend, typically improves overall marketing ROI by 30–50%.
Common Questions
How do I attribute revenue to specific channels?
Use UTM parameters on all campaign links. Set up conversion tracking in Google Analytics. Platform attribution tends to overcount; GA4 tends to undercount. Reality is usually somewhere between the two.
What is a good channel ROAS for UK SMEs?
Varies significantly by margin. For product businesses with 35% gross margin, you need at least 3x ROAS to cover ad spend in gross profit. For service businesses with 65% margin, even 2x ROAS can be highly profitable.
Should I turn off low-ROAS channels completely?
Not necessarily — some channels serve awareness functions even when direct ROAS appears low. Test channel exclusion over 4–8 weeks and measure total revenue impact, not just channel-level ROAS.
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