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Free tree planting CO₂ offset calculator. Estimate annual and cumulative CO₂ uptake from trees planted, per-tree kg/year factors, survival, and a projection horizon. Explore more in our energy and sustainability calculator category.
Last updated: April 18, 2026
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Replace with species- and region-specific factors from forestry guidance when available.
Effective trees (after survival)
90
Annual CO₂
1.98 t
Cumulative (linear)
19.8 t
Annual uptake ≈ 1.98 t/yr × 10 yr. Real stands follow growth curves; use this as a rough planning band.
Planning note
Typical tweak
Survival + species mix
Adjust kg/tree/year to reflect fast-growing species and maintenance.
Planning
Longer horizons
Extend projection years for cumulative totals, knowing growth is not linear in reality.
Rates
Lower or higher kg/yr
Street trees may differ from plantation averages; use local studies when possible.
Conservative factors
Blend of species
Use a blended kg/tree/year when species sequestration differs widely.
Sensitivity
High / low cases
Run low and high kg/tree/year scenarios to bracket uncertainty.
Next step
Carbon offset tool
Pair this estimate with offset pricing and tax tools for decision framing.
Default: 100 trees, 22 kg/tree/year, 90% survival, 10 years — cumulative about 19.8 metric tons CO₂ (linear projection).
The calculator multiplies the number of trees by survival to get an effective stand count. It then multiplies effective trees by an annual kilogram CO₂ per tree factor to estimate annual CO₂ uptake in kilograms, converts to metric tons, and multiplies annual tons by projection years for a simple linear cumulative total. This is not a verified carbon inventory; it is a transparent planning aid.
Effective trees = planted × (survival % ÷ 100)Annual kg CO₂ ≈ effective trees × kg/tree/yearAnnual t CO₂ ≈ annual kg ÷ 1000Cumulative t CO₂ (linear) ≈ annual t × yearsReplace the default kg/tree/year with project-specific values from forestry or scientific literature when possible.
Compare with carbon offset and net zero timeline tools.
Get a custom calculator for your platformReplace defaults with species- and region-specific sequestration data for project decisions.
Share it with teams planning reforestation or offset communications
Suggested hashtags: #Reforestation #Carbon #Offsets #Trees #Calculator