Domestic & Commercial · Load Diversity
Calculate the maximum demand for an Australian domestic or small commercial installation by entering connected loads grouped by category. Diversity factors are applied per category — reflecting that not all connected loads operate simultaneously at full capacity — to estimate a realistic maximum demand figure for supply sizing. This calculator uses a lawful, general methodology rather than reproducing AS/NZS 3000 Table C1 verbatim; for formal compliance calculations, apply the actual published diversity factors from the current standard.
Results for guidance only. Verify against current standards and manufacturer data.
Not a substitute for engineering judgement or a licensed professional.
Loads are grouped by category. Within each category, the largest individual load is counted at 100%, and remaining loads in that category are counted at a diversity factor reflecting the likelihood they operate simultaneously at full capacity. This is a simplified general methodology and does not reproduce the specific diversity factors or worked calculation from AS/NZS 3000 Table C1, which is copyrighted Standards Australia material.