EFV Calculator — Equivalent Fixture Values

Calculate equivalent fixture values (EFV) for plumbing drainage design per AS/NZS 3500.2. Input fixtures and get total EFV for pipe sizing and drainage system design.

What Are Equivalent Fixture Values?

Equivalent Fixture Values (also called fixture units or drainage units) are the standard measure used in AS/NZS 3500.2 to quantify the hydraulic load of each plumbing fixture on a drainage system. The total EFV determines the minimum pipe size for each branch and the main drain.

TradeDesk's EFV calculator lets you add fixtures, see individual and cumulative EFV, and get the resulting pipe size with clause references.