Carbon Offset Project ROI Calculator

This calculator models the economics of a carbon offset project from credit generation through to ROI, and the math changes shape depending on project type. For land-based projects (reforestation, improved forest management, avoided deforestation, soil carbon), annual credits are simply acreage times a fixed sequestration rate per acre per year — 3.5 tCO2e/acre for reforestation, 5.0 for avoided deforestation, and so on. Methane capture and renewable energy projects use area only as a rough capacity proxy rather than a real sequestration rate, since their credits come from displaced emissions, not carbon uptake. Every project type then loses a chunk of its gross credits to a buffer pool deduction — 20% for land-based projects, 5% for others — reflecting the risk-reserve credits that registries like Verra withhold against reversal (a wildfire undoing a forest's stored carbon, for instance).

Costs are broken into a registry-specific registration fee, a one-time validation cost, periodic third-party verification (assumed every 5 years), and ongoing annual monitoring — all scaled by whether the project is land-based. Revenue is net annual credits times your input credit price, compounded over the crediting period, and the calculator derives ROI, a breakeven credit price, payback period, and cost per credit from those totals. The sequestration rates and cost figures here are representative industry averages, not project-specific projections: real numbers depend heavily on soil type, species mix, baseline scenarios, and the specific registry protocol, so treat this as a first-pass feasibility screen rather than an investment-grade pro forma.