AS 4970-2025 CALCULATOR

Calculate root zones & encroachment.

 
 
 
 

The AS 4970-2025 Calculator is a free web app based on the Australian Standard® AS 4970-2025 Protection of trees on development sites.

Key Features

  • Accepts circumference or diameter measurements

  • Calculates diameter at standard height (DSH) and diameter above buttress (DAB) for single and multi-stemmed trees

  • Calculates notional root zones (NRZ) and structural root zones (SRZ)

  • Calculates two types of encroachment

  • Smartphone optimised

  • Easy to use in the field

  • Free to use

 
Open the calculator