Carbon Sequestration Calculator

Carbon sequestration is the process by which ecosystems — forests, soils, wetlands, and oceans — absorb CO₂ from the atmosphere and store it as organic matter or biomass. It is a critical natural mechanism for reducing atmospheric greenhouse gas concentrations and mitigating climate change. Quantifying sequestration helps land managers, conservationists, and policymakers prioritise restoration investments.

Rates vary significantly by ecosystem. Tropical forests typically sequester 5–20 tonnes of CO₂ per hectare per year, temperate forests 2–8 t CO₂/ha/yr, and boreal forests 1–4 t CO₂/ha/yr. Mangroves are among the most carbon-dense ecosystems on Earth, often sequestering 10–25 t CO₂/ha/yr when soil carbon is included. This calculator uses science-based mean values from peer-reviewed databases.

The calculator estimates annual and cumulative CO₂ absorption across two main carbon pools: above-ground biomass (trees, shrubs, and vegetation) and soil organic carbon. You can choose to include or exclude the soil carbon pool depending on your project scope. Results are expressed in metric tonnes of CO₂ equivalent (t CO₂e).

Sequestration rates depend on factors like climate, precipitation, tree species, canopy density, soil type, and land-use history. Tropical forests grow faster in warm, wet climates, accumulating biomass rapidly. Boreal forests grow more slowly but store substantial carbon in frozen soils. Mangroves lock carbon in both their dense root systems and waterlogged sediments, making them exceptionally efficient carbon sinks per unit area.

Yes — you can toggle the 'Include Soil Carbon Pool' option to add below-ground and soil organic carbon to your estimate. Soil carbon typically represents 20–50% of total ecosystem carbon storage and is especially significant in grasslands, peatlands, and mangroves. Excluding it will give a conservative, above-ground-only estimate.

This calculator provides educational estimates suitable for feasibility assessments, grant applications, and awareness purposes. For formal carbon credit projects (e.g. Verra VCS, Gold Standard), you would need certified field measurements, baseline assessments, and third-party verification. Use these results as an indicative starting point for scoping your project's potential.

Vegetation or canopy density acts as a multiplier on the base sequestration rate. A high-density mature canopy operates near its full biological capacity, while a low-density degraded site may sequester 30–50% less carbon per hectare. Selecting the correct density for your site ensures a more realistic estimate and helps you model the impact of restoration efforts over time.

The average passenger car in the US emits approximately 4.6 metric tonnes of CO₂ per year (US EPA figure). The calculator divides your annual CO₂ sequestration total by 4.6 to give a relatable real-world equivalent — showing how many cars' worth of emissions your ecosystem absorbs each year. This equivalency is commonly used in environmental reporting and education.