Tree Planting Impact Calculator
Estimate how much CO₂ a tree-planting project will absorb over time, accounting for tree species, survival rate, and a growth factor. Useful for conservation projects, carbon offset planning, and school initiatives.
About this calculator
The formula estimates total CO₂ sequestration (in lbs or kg, depending on the tree-type coefficient) over a chosen period: Total CO₂ = treesToPlant × treeType × years × survivalRate × (1 + years × 0.03). Here, treeType is a species-specific annual sequestration coefficient (e.g., a fast-growing tree absorbs more per year than a slow-growing one). The survivalRate (entered as a decimal, e.g., 0.80 for 80%) accounts for the reality that not all planted trees survive. The growth factor (1 + years × 0.03) applies a 3% annual compounding growth to reflect that older, larger trees sequester carbon at an accelerating rate. Multiplying all terms together gives the cumulative CO₂ absorbed by the surviving, growing trees over the full period.
How to use
Imagine you plant 500 trees of a medium-growth species with a treeType coefficient of 48 (lbs CO₂/year), over 10 years, with an 85% survival rate. Growth factor = 1 + (10 × 0.03) = 1.30. Total CO₂ = 500 × 48 × 10 × 0.85 × 1.30 = 500 × 48 × 10 × 1.105 = 265,200 lbs of CO₂. Enter 500 trees, your species coefficient, 10 years, and 0.85 as the survival rate to see the result instantly.
Frequently asked questions
How much CO₂ does a single tree absorb over its lifetime?
It depends heavily on the species, climate, and soil conditions, but a commonly cited estimate is that a mature tree absorbs roughly 48 lbs (about 22 kg) of CO₂ per year. Over a 40-year lifespan that amounts to nearly 2,000 lbs (around 900 kg) per tree. Fast-growing species like poplars and eucalyptus sequester more in early years, while slow-growing hardwoods like oaks accumulate carbon over centuries. This calculator uses a species coefficient (treeType) to reflect these differences, so choosing the right coefficient for your project matters significantly.
Why does survival rate matter so much in a tree planting impact calculation?
Planted trees face threats from drought, pests, disease, and poor soil, meaning a significant fraction never reach maturity. If you plant 1,000 trees but only 70% survive, your effective sequestration is the same as planting 700 trees — a 30% reduction in impact. Studies show survival rates for community planting projects can range from 50% to 90% depending on aftercare. Using a realistic survival rate rather than assuming 100% success gives you a defensible, honest estimate of your project's carbon benefit.
When should I use a tree planting impact calculator instead of a formal carbon credit methodology?
This calculator is ideal for quick estimates, educational purposes, grant applications, and internal sustainability reporting where a ballpark figure is sufficient. Formal carbon credit frameworks — such as those verified by Gold Standard or Verra — require detailed site assessments, species data, monitoring protocols, and third-party audits. If you plan to sell carbon credits or make legally binding offset claims, you will need to follow an approved methodology. For everything else, this calculator provides a transparent, formula-driven starting point that you can refine as your project data improves.