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Market-neutral small-business guide

Campaign Profit vs ROAS vs MER: A Comparison

Compare campaign profit, platform ROAS and explicitly defined blended MER by numerator, denominator, scope and contribution boundary.

Define each metric symmetrically

What campaign profit, ROAS and MER measure
MetricNumeratorDenominatorTypical stated scopeUnitUseful forDoes not prove
Campaign profitIncremental customer contribution less total campaign costNot a ratioOne explicitly bounded campaign and periodCurrency unitsTesting retained campaign economicsCausal incrementality or cash generation
ROASAttributed conversion valuePlatform ad spendCampaign or channel under the platform's settingsx ratio or percentageReading platform-attributed value per ad-cost unitProfit, incrementality or whole-business efficiency
MERTotal scoped business revenueTotal scoped marketing spendExplicit business-wide or selected scope for one periodx ratioReading a blended top-down revenue/spend relationshipContribution, channel attribution or causal lift
In this article, MER always means total scoped revenue ÷ total scoped marketing spend for the same period. List every included revenue and spend category.

Align before comparing

  • Use one period, currency and indirect-tax basis. (not complete)
  • Name conversion value, attribution model, counting rule and window for ROAS. (not complete)
  • Name included business revenue and marketing spend for MER. (not complete)
  • Name contribution, incrementality and total campaign-cost assumptions for campaign profit. (not complete)
  • Keep ratio units as x or percentage and currency amounts as currency. (not complete)

Worked example: 1,200 profit, 4.0x ROAS and 3.0x MER

Invented neutral scenario for one period. The three results use different numerators and scopes, so none is the winner.

Three views of one period
ViewStated inputsCalculationResult
Campaign profit3,000 total campaign cost; 100 attributed customers; 70% user-entered incrementality; 60 contribution per incremental customer70 × 60 - 3,0001,200; 40% campaign ROI
Platform ROAS10,000 attributed conversion value; 2,500 platform ad spend10,000 ÷ 2,5004.0x
MER15,000 total scoped revenue; 5,000 total scoped marketing spend15,000 ÷ 5,0003.0x
All amounts are currency units. Campaign profit uses 70 assumed incremental customers; ROAS uses platform-attributed conversion value; MER uses the wider included business scope.

Choose the view for a named decision

Decision hand-off by metric view
Decision questionStart withRequired next check
Did the bounded campaign scenario retain contribution?Campaign profitTest incrementality and omitted costs
What attributed value did the platform report per ad-cost unit?ROASReconcile attribution settings and contribution
How did total scoped revenue compare with total scoped marketing spend?MERList inclusions and reconcile contribution/cash

Campaign metric questions

Does high ROAS mean a campaign is profitable?
Not by itself. ROAS uses attributed conversion value and ad spend; it does not subtract delivery costs or prove incrementality.
What belongs in MER?
For this article, include the total revenue and total marketing spend explicitly selected for the same period. Because industry usage varies, publish the inclusion list beside the ratio.
Is attributed revenue incremental revenue?
No. Attribution assigns credit under configured rules. Incrementality asks what would have happened without the activity and needs separate evidence.
Which metric is best?
None is universally best. Use the measure whose numerator, denominator and scope match the named decision, then reconcile the other boundaries.

Sources and methodology

Calculate with the correct owner

Change history

  1. — Initial public release of the article after pre-launch factual, editorial, source and presentation review.