Carbon Offset Calculator
Calculate the number of trees or the cost needed to offset your CO2 emissions.
Trees Needed to Offset
Annual Offset Cost
Calculation Steps
How Carbon Offsetting Works
Carbon offsetting compensates for the greenhouse gases you emit by funding an equivalent reduction or removal of CO₂ elsewhere. Planting and protecting trees is one of the most common nature-based methods, because trees absorb carbon dioxide as they grow. A single mature tree absorbs roughly 0.021 tonnes (21 kilograms) of CO₂ per year, so the number of trees needed to offset your footprint depends directly on how much CO₂ you produce annually.
The Formulas
- Trees needed: annual emissions ÷ 0.021 tonnes per tree (rounded up to the next whole tree)
- Offset cost: annual emissions × price per tonne
Key Considerations
- Tree absorption rates vary by species, age, climate, and location.
- Newly planted trees take years to reach full absorption capacity.
- Offset prices on the voluntary carbon market typically range from a few dollars to over $50 per tonne, depending on project quality.
- Reducing emissions at the source is always more effective than offsetting alone.
Note: This calculator provides estimates based on an average tree absorption rate of 0.021 tonnes of CO₂ per year. Actual offsetting results depend on the specific projects you support and the methods used to verify carbon removal.