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AS 4970 Calculator

Root zone (NRZ/SRZ) and encroachment calculations per AS 4970-2025 — Protection of trees on development sites. Accepts diameter or circumference, and combines multiple stems for a multi-stemmed tree.

Calculate Root Zones

cm
NRZ radius (m)
NRZ area (m²)
cm
SRZ radius (m)
SRZ area (m²)

Calculate Encroachment

Encroachment Type A: works intersecting along a single straight edge.

m
Distance for minor encroachment (10%)
NRZ radius (m)
SRZ radius (m)
NRZ area (m²)
Encroachment area (m²)
Encroachment (%)
Upload a site plan or aerial photo to get started — JPG, PNG, or PDF.

Tree Log.

Tree Log.

Map failed to load. This is usually a network hiccup — try reloading the artifact.
Line the crosshair up on the tree, then tap ➕ Add — or 📷 for one at your location
Map failed to load. This is usually a network hiccup — try reloading.
Line the crosshair up on the tree, then tap ➕ Add — or 📷 for one at your location