Contribution margin
Advanced ecommerce economics model beyond gross margin by including variable fulfillment and ad costs.
Example scenario
A digitally native skin-care brand closes a month at three hundred twenty thousand dollars in recognized net revenue after returns reserves while variable product COGS lands at one hundred twenty-eight thousand dollars (landed cost including packaging). Outbound parcel spend third-party logistics pick-pack-postage totals thirty-six thousand dollars and blended Meta plus Google plus affiliate commissions labeled paid media sum to sixty-four thousand dollars. Contribution margin dollars net ninety-two thousand dollars after those variable line items, equal to twenty-eight point seven five percent of revenue on this trailing-month slice before headquarters payroll and rent.
Contribution margin
Revenue - COGS - shipping - ad spend
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How to run the ecommerce contribution margin wizard
- Input trailing thirty-day net revenue after returns and payment refunds—match the same fiscal calendar your finance sheet uses so COGS accruals line up with recognition.
- Enter COGS tied to units shipped in that window (landed cost including inbound freight allocate and consumables); exclude capitalized inventory swings unless your board approved that mapping.
- Add shipping and fulfillment variable cash costs—carrier labels, 3PL pick-pack, inserts, and warehouse outbound touches—while leaving fixed warehouse lease and salaried ops out of this wizard.
- Type consolidated paid media invoices plus attributable platform fees for the period (often Meta, Google, TikTok, affiliates); compare dollar contribution margin and contribution margin percent before layering salaries, software amortization, and corporate overhead.
DTC contribution margin & cost-structure planning ranges
- Reported gross margin before OpEx (revenue minus COGS, category varies)
- Often ~45–65% for many consumer brands; beauty and supplements skew higher than heavy apparel
- Variable fulfillment & outbound logistics as % of net revenue (typical planning bands)
- ~8–15% for scaled parcel-heavy DTC depending on free-shipping policy and 3PL rates
- Net-revenue-weighted paid acquisition spend (blended paid social + search + partners)
- Commonly modeled ~15–30% at growth pace; contribution margin % moves materially with this line
Best use cases
- Forecasting and scenario planning
- Client education and pre-qualification
- Budget and performance decision support
Frequently asked questions
Why does this wizard exclude payroll, rent, and SaaS from contribution margin?
Contribution margin isolates revenue minus truly variable costs that scale roughly with orders and traffic so merchandising and growth leaders can stress-test discount depth, channel mix, and 3PL rates. Fixed OpEx still determines net income—allocate it afterward using your FP&A model so you do not double-count warehouse salaries embedded inside fulfillment invoices.
Should shipping include free-shipping subsidies and return-label costs?
Yes if they move with order volume in your accounting treatment: outbound postage, packaging, carrier surcharges, and incremental return logistics often belong in variable fulfillment. If finance books returns as contra-revenue, net revenue down before running this wizard so COGS and shipping align with fulfilled units rather than overstating contribution.
My gross margin is forty percent but contribution margin looks thin—what usually breaks?
High blended CAC as a percent of revenue or subsidized shipping frequently compresses contribution even when product margin looks healthy. Segment paid spend by prospecting versus retention and strip agency retainers or creative production out if those are fixed monthly charges rather than marginal acquisition dollars.
Does contribution margin percent equal Shopify’s reporting margin?
Rarely—Shopify reports emphasize product margin before fully burdened logistics and often omit off-platform ad invoices. Reconcile by exporting orders plus carrier bills plus media receipts into one month, then recompute this calculator’s numerator and denominator off finance’s definition of net revenue.
Glossary
Scenario modeling
Testing multiple assumptions to estimate possible outcomes before execution.
Commercial intent
User behavior indicating readiness to buy, subscribe, or request a quote.
Related calculators
Category: Ecommerce finance & unit economicsTopics: Contribution margin, DTC variable costs, Paid acquisition efficiency
Last reviewed: 2026-05-07
Reviewed by: Calclet Growth Team