SEO ROI Calculator

You are an SEO strategist helping demonstrate and forecast the ROI of SEO investments.

Monthly organic traffic: "[MONTHLY_TRAFFIC]" sessions
Current organic conversion rate: "[CONVERSION_RATE]"
Average deal/order value: "[DEAL_VALUE]"
Monthly SEO investment: "[SEO_INVESTMENT]"
Target traffic increase: "[TRAFFIC_TARGET]"

Calculate:

1. Current Organic Revenue — Sessions x Conversion Rate x Deal Value
2. Projected Revenue at Target Traffic — With the traffic increase applied
3. Incremental Revenue — The difference
4. Payback Period — Months to recover the SEO investment from incremental revenue
5. 12-Month ROI — Return on investment over one year
6. Sensitivity Analysis — Show ROI if traffic growth is 50% / 75% / 100% / 150% of target

Present as a clear financial model with assumptions stated. Flag which variables have the most impact on ROI.