Compare the questions
ROAS asks how much revenue a reporting system attributes per unit of advertising spend. Contribution asks what remains after the agreed variable costs. Net profit includes the relevant remaining costs under the business’s accounting definition. Name the measure instead of using these terms interchangeably.
Illustrative two-campaign comparison
Campaign A: £10,000 attributed revenue and £2,000 advertising spend gives 5× ROAS. Suppose £7,000 of other agreed variable costs leaves £1,000 after advertising. Campaign B: £8,000 revenue, £2,000 advertising and £4,000 other variable costs gives 4× ROAS but £2,000 contribution after advertising. These invented figures illustrate the arithmetic; attribution accuracy and fixed costs are not assessed.
Use a decision table
| Question | Useful evidence |
|---|---|
| Are campaign signals improving? | Attributed conversions and revenue with stated rules. |
| Are orders economically attractive? | Net order value and agreed variable costs. |
| Can we acquire new customers sustainably? | CAC, cohort contribution and payback assumptions. |
| Did advertising cause additional sales? | An appropriately designed incremental-impact study. |
A practical weekly review
Read campaign signals beside store revenue, new-customer counts, returns and contribution. Investigate changes in the offer or mix before changing spending targets. Confirm that platform reports are not added together as if each owns unique orders.
What to standardize
Agree revenue, cost, attribution and time definitions with marketing and finance. Keep campaign efficiency and overall business economics visible together. No single ratio can replace the underlying decision.
Use a small scenario to expose the difference
Illustrative example: a campaign spends £1,000 and reports £5,000 in attributed sales, giving a reported ROAS of five. If the defined contribution before advertising is £1,500, subtracting that £1,000 leaves £500 before costs excluded from the measure. Another campaign with lower ROAS could still contribute more if its product mix and costs differ. These are teaching figures, not XnMark client results.
Before reallocating budget, check whether the attributed revenue is comparable with the business revenue definition and whether the cost assumptions reflect the market being reviewed. Include returns, discounts and fulfilment in the agreed calculation where relevant. A favourable platform ratio can help identify a question to investigate, but it should not replace the commercial review. Keep the acquisition measure, contribution measure and total business outcome visible alongside one another.
- Show the revenue basis, advertising spend and included costs in the same table.
- Separate platform attribution from incremental impact.
- Compare like-for-like periods and product mixes before drawing a budget conclusion.
Understand contribution margin →
Frequently asked questions
Why can an attractive ad ratio coexist with weak profit?
ROAS compares attributed revenue with advertising spend. Profitability requires a wider cost definition. A higher ROAS can accompany weaker business performance when discounts, product mix, returns or other costs change.
Can higher ROAS coincide with lower profit?
Yes. Margin, returns, discounts and the customer mix can change while attributed advertising revenue rises. Compare a consistently defined contribution measure.
Should we ignore ROAS completely?
No. It can be a useful campaign signal. Interpret it alongside business economics and the limits of attribution rather than use it as the sole spending rule.
Sources and further reading
Primary material for the concepts discussed here. Our practical checklists and illustrative examples are editorial recommendations. Source links open in a new tab.