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MEASUREMENT & REPORTING

Marketing Measurement & Reporting Calculators

Build a report that separates attribution from business performance. Compare platform ROAS with blended MER, contribution-based POAS and the economics behind the headline number.

Reviewed September 23, 2026 · ROAS Lab Editorial Team

Before you open a calculator

Most reporting problems are definition problems before they are math problems. Two dashboards can show different revenue for the same week because attribution windows, modeled conversions, refunds and channel rules differ. That does not automatically mean one system is “wrong.” It means the report needs a source-of-truth hierarchy.

Use platform metrics to understand campaign delivery and optimization. Use store, CRM or finance data to understand what the business actually booked. Then use the calculators here to connect the two without pretending they are identical.

A clean report should tell the reader which number is attributed, which is blended, and which includes contribution costs. ROAS, MER and POAS belong together precisely because they answer different questions.

Calculators in this category

These tools answer different parts of the same business question. Use only the inputs that match the period and channel you are reviewing.

ATTRIBUTED REVENUEROAS CalculatorMeasure attributed revenue generated per advertising dollar.Open calculator →BLENDED BUSINESS VIEWMER CalculatorCompare total business revenue with total marketing spend.Open calculator →CONTRIBUTION VIEWPOAS CalculatorMeasure contribution profit generated per advertising dollar.Open calculator →PLANNINGROAS Scenario ComparisonCompare assumptions and see how economics change under multiple scenarios.Open calculator →BREAK-EVENBreak-Even ROAS CalculatorAnchor reported efficiency to the contribution needed to cover advertising.Open calculator →MARGINProfit Margin CalculatorCheck the profit structure behind reported revenue.Open calculator →

ILLUSTRATIVE EXAMPLE

Three ratios can describe the same week without being interchangeable

Assume a store records $120,000 in total net revenue and spends $30,000 across marketing. MER is 4.0x. Within the same week, one ad platform attributes $75,000 of revenue to $20,000 of its own spend, giving platform ROAS of 3.75x. If the contribution generated from that attributed revenue is $24,000, POAS on the $20,000 spend is 1.20x.

Blended MER4.00x

Platform ROAS3.75x

Contribution$24k

POAS1.20x

None of those ratios should be substituted for another. MER describes the whole business-to-marketing relationship, platform ROAS describes attributed revenue inside a platform, and POAS introduces contribution profit.

This is an illustrative scenario, not a benchmark or a claim about typical performance. Replace every number with your own store, CRM and ad-platform data.

DATA CHECKLIST

What to pull before calculating

Good calculator outputs depend on consistent inputs. Keep source dates and definitions beside the numbers so you can reproduce the result later.

Input	Where to get it	Check before using it
Net business revenue	Store or finance	Use the revenue definition your business reports consistently; exclude tax collected on behalf of government where appropriate.
Marketing spend	Finance + platforms	Document which channels and fees are included in the blended denominator.
Platform-attributed revenue	Ad platform	Record attribution window and reporting date because late conversions can move.
Contribution profit	Finance or unit-economics model	Use the same revenue cohort and include relevant variable costs.
Refunds and adjustments	Store or finance	Decide whether reporting uses booked revenue or matured net revenue and label it clearly.

QUALITY CHECK

Three mistakes that change the answer

Calling platform attribution total business revenue

Attributed revenue is useful for campaign optimization, but it is not automatically the same as booked net revenue.

Changing spend scope between weeks

MER becomes meaningless if one week includes agency fees or affiliates and the next week excludes them.

Reporting a ratio without the numerator and denominator

Always show the underlying revenue or contribution and spend. A ratio alone is harder to audit.

WEEKLY REPORTING

Where this belongs in a real report

A practical executive view can show net revenue, total marketing spend, MER, platform ROAS by major channel, contribution and POAS. Keep footnotes short but explicit: attribution window, tax treatment, refund treatment and whether spend includes fees.

For trend analysis, freeze prior-period numbers after a reasonable maturation window. Constantly rewriting old weeks as platforms update attribution can make operating discussions confusing unless the revision process is documented.

Questions people usually ask after the first calculation

Which metric should go on an executive dashboard?

Usually more than one. A blended business metric such as MER can sit beside channel-level ROAS and a contribution metric such as POAS when the data is available.

Why does platform ROAS not match store revenue?

Attribution windows, modeled conversions, cross-device behavior, refunds and channel overlap can all produce differences. Reconcile definitions instead of forcing the numbers to match.

Can MER replace attribution?

No. MER is useful for the blended business view but does not tell you which campaign or channel caused a specific sale.

Should old reports be updated after refunds?

That depends on the operating process. A mature net-revenue view is useful, but revisions should be handled consistently so trend lines remain understandable.

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