Methodology: Content Marketing Payback Calculator

1. Scope

Projects cumulative ROI, payback month, and 12/24/36-month returns for a content investment. It assumes organic traffic compounds with new content and decays if publishing stops — both of which are simplifications.

2. Inputs and outputs

Inputs

monthlyContentSpend number (currency)
articlesPerMonth number
trafficPerArticlePerMonth number
conversionRate percent
averageOrderValue number (currency)
horizonMonths number default: 36

Outputs

cumulativeTraffic

Sum of per-article traffic across the horizon.
cumulativeRevenue

Conversions × AOV across the horizon.
paybackMonth

First month at which cumulative revenue ≥ cumulative cost.
roi12m

ROI at month 12.

Engine source: src/lib/content-marketing-payback-calculator/engine.ts

3. Formula / scoring logic

traffic_m     = articles_total * traffic_per_article
conversions_m = traffic_m * cvr
revenue_m     = conversions_m * aov
cum_cost      = monthly_spend * m
cum_revenue   = sum(revenue_1..m)

4. Assumptions

Published articles retain their traffic indefinitely at the stated per-month level. In reality, half-life varies widely by topic and SERP competitiveness.
Conversion rate is constant across traffic sources. Top-of-funnel traffic typically converts 5–10× lower than bottom-of-funnel.
No cannibalisation between articles — each new piece adds incremental traffic.

5. Data sources

This tool relies on user inputs and standard arithmetic; no external benchmark data is bundled. When a question depends on an industry reference (for example, typical churn rates or hourly-wage medians), the linked adjacent tools cite their primary sources on their own methodology pages.

6. Known limitations

No peer-reviewed source for "average content ROI" or "typical payback period". We model sensitivity to user inputs rather than citing industry averages.
Traffic-to-revenue assumes single-touch attribution. Multi-touch journeys (content → email → purchase) credit content less directly.

7. Reproducibility

Input
spend = $2,000/mo, articles = 4/mo, traffic = 100/article/mo, cvr = 1%, aov = $100, horizon = 36.

Expected output
At month 36: 2,880 articles-months of compounded traffic, cumulative revenue ≈ $14,400, payback ≈ not reached at baseline inputs.

8. Change log

2026-04-24 methodology page first published.