Trees-to-Offset Calculator
A mature tree takes up roughly 21.8 kg of CO₂ a year (about 48 lb, Arbor Day Foundation), so about 46 mature trees take up one tonne a year. Allowing for 85% survival, that means planting about 54 trees per tonne. Young trees take up much less, and the real figure depends on species, site and age.
How it works
- Trees needed = yearly emissions ÷ CO₂ taken up by one mature tree.
- Trees to plant = trees needed ÷ survival rate (85%, our program-wide figure).
- You can change both assumptions in the calculator.
- This is an indicative estimate, not carbon credits; credits need a verified project.
Sources: Arbor Day Foundation: The value of trees
Frequently asked questions
How much CO₂ does one tree absorb?
A commonly used figure is about 21.8 kg (48 lb) a year for a mature tree, from the Arbor Day Foundation. It varies widely by species, climate and age.
Can planting trees make my company carbon neutral?
Trees can balance part of your remaining emissions, but they take years to mature. Reduce emissions first, then use trees and verified credits for what remains.
Why allow for survival?
Not every sapling survives. Planting extra makes sure enough trees reach maturity.
Are these trees carbon credits?
No. Carbon credits need a project under an approved methodology with independent verification.
