Contribution after paid ads
Tri-variable subtraction then ratio output mirrors ecommerce P&L snippets—exact pattern performance marketers embed on landing pages.
Example scenario
An omnichannel accessories brand closes a trailing-seven-day Shopify cohort posting one hundred twenty-eight thousand dollars GA4-purchase revenue restricted to SKUs sourced from same-origin factories inside finance policy. Landed cost of goods sold lands near fifty-one thousand eight hundred dollars once inbound freight and packaging burden allocate against fulfilled units while blended Meta Advantage-plus and Google PMax invoices plus agency tech fees consolidate into twenty-eight thousand four hundred dollars paid acquisition outlays. Subtracting variable product cost and media yields roughly forty-seven thousand eight hundred dollars contribution dollars—margin-on-revenue after ads near thirty-seven point three percent before warehouse rent, salaries, or debt service layers beneath GAAP operating income.
Contribution after paid ads
Revenue − COGS − ad spend
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How to calculate contribution dollars and margin percent after paid ads
- Pull attributed revenue net of refunds for the cohort window—tie SKUs to inventory costing policies rather than aspirational MSRP.
- Enter fully loaded COGS tied to fulfilled units—exclude fulfillment-center fixed rent unless FP&A already allocates variable pick-pack cents into COGS pools.
- Aggregate paid media spend inclusive of platform invoices, creator commissions booked as media, and attributable agency percentages leadership treats as variable acquisition.
- Divide contribution dollars by revenue for margin percent after ads—compare against MER targets only after confirming numerator expenses align.
How operators benchmark contribution after ads versus headline MER
- Marketing efficiency ratio context
- MER equals revenue divided by total ad spend—healthy DTC operators stack contribution math underneath MER because gross profit still needs to clear COGS before media even enters
- COGS completeness
- Finance-grade COGS bundles payment-processing interchange allocated to COGS lines, shrink, and return-write-offs—sparse spreadsheets counting wholesale invoices alone inflate contribution optics
- Discount and promo leakage
- Net revenue after coupons belongs in the numerator—mis-matching gross merchandise value against net COGS collapses interpretability against Board-pack margins
Best use cases
- Growth and performance planning
- Budget and forecast scenario modeling
- Client-facing pre-qualification and education
Frequently asked questions
Should attributed revenue match Shopify gross sales or GA net revenue?
Use whatever denominator pairs with COGS timing—GA net revenue typically nets discounts while Shopify gross inflates unless finance reconciles both exports nightly.
Where do influencer fixed retainers belong if performance fluctuates?
Capital markets teams vary—allocate retainers across attributed revenue hours using internal drivers or park them in fixed marketing overhead when contracts ignore ROAS clauses.
Why exclude organic contribution when judging paid ads efficiency?
Because this calculator isolates incremental profitability on attributed revenue slices tied to campaigns—blended contribution belongs in portfolio dashboards with incrementality studies layered on.
Does margin percent after ads equal EBITDA?
No—still missing operating expenses like payroll, software subscriptions outside COGS, and interest—contribution margin answers variable economics before operating leverage.
Glossary
Scenario modeling
Comparing multiple assumption sets to estimate potential outcomes before execution.
Conversion intent
User behavior that indicates readiness to take a commercial action such as signup or purchase.
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Category: Ecommerce unit economics & paid acquisitionTopics: Contribution margin after ads, Attributed revenue, COGS versus media spend
Last reviewed: 2026-05-07
Reviewed by: Calclet Growth Team