roi-calculator

# ROI Calculator This skill helps you calculate and communicate the return on investment for influencer marketing campaigns using various methodologies appropriate for your goals and available data. > **Cross-discipline (paid ads):** this is the shared **return-math engine** for paid ads — [paid-measurement-loop](../../../ad/scale/paid-measurement-loop/SKILL.md), [attribution-reconciler](../../../ad/scale/attribution-reconciler/SKILL.md), and budget-optimizer delegate ROAS/CPA/payback ratios here rather than recomputing them. Save paid runs under `memory/ad/roi-calculator/`. ## Quick Start Shortest invocation: ``` Calculate ROI for our influencer campaign: $25K spend, $72K revenue, 2.1M reach ``` Common scenario — compare methods before reporting: ``` What's the ROI of our campaign using direct revenue, EMV, and LTV-based methods? ``` ## Skill Contract - **Reads**: campaign spend breakdown, results data (reach, impressions, engagements, clicks, conversions, revenue, new customers), AOV and repeat-rate data if LTV is in scope, any prior performance output from `performance-analyzer`. - **Writes**: ROI calculation file at `memory/influencer/roi-calculator/YYYY-MM-DD-<topic>.md` containing direct ROI/ROAS, EMV, cost-efficiency metrics, attribution-modeled revenue, LTV-based ROI, by-influencer ROI, and a summary report block. - **Promotes**: only with separate authorization, durable headline numbers with their attribution window, source, and uncertainty; a calculation re...