Carbon Sequestration Calculator

Enter your ecosystem type (forest, soil, or ocean), area, and a few key parameters to estimate how much CO₂ is sequestered per year. The Carbon Sequestration Calculator returns your annual CO₂ absorbed, total sequestration over time, and a breakdown by carbon pool — helping you quantify the climate value of land or restoration projects.

Select the primary ecosystem or restoration activity.

Total land or ocean area covered by the ecosystem.

Number of years over which to estimate cumulative sequestration.

Approximate canopy or vegetation coverage of the site.

Soil carbon can account for 20–50% of total ecosystem sequestration.

Results

Annual CO₂ Sequestered

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Total CO₂ over Timeframe

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Above-Ground Biomass Carbon

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Soil Carbon Pool

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Equivalent Cars Taken Off Road / Year

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Sequestration Rate (per Hectare/yr)

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Cumulative CO₂ Sequestered Over Time (tonnes)

Results Table

Frequently Asked Questions

What is carbon sequestration and why does it matter?

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.

How much CO₂ does a forest sequester per hectare per year?

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.

What does the calculator actually measure?

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).

Why do different ecosystems sequester different amounts of carbon?

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.

Does the calculator include soil carbon and below-ground storage?

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.

Can I use this calculator for carbon credit or offset projects?

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.

How does vegetation density affect the sequestration estimate?

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.

How is the 'cars equivalent' output calculated?

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.

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