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Tree Canopy Requirement Calculator

Work out tree canopy requirement instantly with clear inputs, formula shown and shareable results.

About Tree Canopy Requirement Calculator

Canopy targets are converted to tree numbers using the mature canopy area of the species chosen: about 20 square metres for a small ornamental, 40 for a medium tree and 80 or more for a large native. Because the target refers to mature canopy, the planting must allow the space and soil volume for trees to reach that size.

Formula

Tree count

Trees = ceil(site area x target canopy percentage / canopy area per mature tree)

Worked example

With the default values below, Tree Canopy Requirement Calculator returns Additional trees required of 90. Change any input above and every figure here is recalculated in your browser.

Inputs used

Site areaminimum 1 m²
20,000 m²
Target canopy coveraccepts 1–90 %
30 %
Mature canopy area per treeminimum 1 m²
40 m²
Existing trees retainedminimum 0
60

Results

Additional trees required
90
Total trees needed
150
Canopy area targeted
6,000 m²
Canopy from existing trees
2,400 m²

Step by step

  1. 1Values used
  2. 2Tree count
  3. 3Additional trees required= 90
  4. 4Total trees needed= 150
  5. 5Canopy area targeted= 6,000 m²
  6. 6Canopy from existing trees= 2,400 m²

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Tree Canopy Requirement figure worked out?

Trees = ceil(site area x target canopy percentage / canopy area per mature tree). Canopy targets are converted to tree numbers using the mature canopy area of the species chosen: about 20 square metres for a small ornamental, 40 for a medium tree and 80 or more for a large native.

Why do urban trees rarely reach mature canopy?

Restricted soil volume. A large tree needs on the order of 20 to 30 cubic metres of usable soil, and street pits typically provide a fraction of that, which is why urban canopy targets fail on soil rather than on tree count.

What values do I need to enter?

This calculator takes 4 inputs: Site area, Target canopy cover, Mature canopy area per tree, Existing trees retained. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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