ads-mathlisted

# PPC Financial Calculator & Modeling <!-- Created: 2026-04-13 | v1.5 --> <!-- Source: itallstartedwithaidea/google-ads-skills (PPC math concept) --> ## Process 1. Ask the user what calculation they need (or detect from context) 2. Collect required inputs (from pasted data, exports, or verbal description) 3. Perform calculations with clear formulas shown 4. Present results with interpretation and recommendations 5. Flag any concerning metrics or benchmarks ## Calculators ### 1. CPA Calculator ``` CPA = Total Spend / Total Conversions Inputs needed: - Total ad spend (period) - Total conversions (same period) Output: - CPA with period context - CPA trend (if historical data provided) - Comparison to industry benchmark (from benchmarks.md) ``` ### 2. ROAS Calculator ``` ROAS = Revenue from Ads / Ad Spend ROAS% = (Revenue - Spend) / Spend × 100 Inputs needed: - Total ad spend - Total revenue attributed to ads Output: - ROAS as ratio (e.g., 3.5x) and percentage (250%) - Break-even ROAS (based on margins if provided) - Comparison to platform benchmarks ``` ### 3. Break-Even Analysis ``` Break-Even CPA = Average Order Value × Profit Margin Break-Even ROAS = 1 / Profit Margin Inputs needed: - Average order value (AOV) OR average deal value - Profit margin (gross margin %) - Current CPA or ROAS Output: - Maximum profitable CPA - Minimum profitable ROAS - Current headroom (how far above/below break-even) - Recommendation: scale, maintain, or cut ``` ### 4. Impression S