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Tree CO2 Absorption Calculator

How much CO₂ trees absorb over time, and how many you need to offset a footprint.

Enter values

Results update as you type.

Result

Trees needed

239

Land needed
0.595 ha
CO₂ absorbed over the period
100 tonnes
Absorption per tree per year
21 kg
Time to full absorption
Trees reach peak absorption after 20–30 years

About the Tree CO2 Absorption Calculator

How much CO₂ trees absorb over time, and how many you need to offset a footprint.

Also known as: trees to offset carbon, tree carbon sequestration, how many trees to plant, forest offset.

How to use this calculator

  1. Enter calculate, co₂ absorbed per tree, over how many years and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

trees = annual CO₂ ÷ absorption per tree per year

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Trees to offset a footprint
  • Annual CO₂ to offset = 5,000 kg
  • CO₂ absorbed per tree = 21 kg/year
  • Over how many years = 20

the calculator returns:

  • Trees needed: 239
  • Land needed: 0.595 ha
  • CO₂ absorbed over the period: 100 tonnes
  • Absorption per tree per year: 21 kg