Bathroom Renovations

Bathroom ventilation room-area helper

This tool calculates floor area only. Use that result with the ventilation requirements, sizing method and manufacturer instructions that apply where you live.

Room floor area: 40.0 sq ft
Use this measurement when comparing local ventilation guidance and product sizing.

Why we do not output a required fan rating

Ventilation design can depend on room size, fixture count, duct configuration, local code, building type and product instructions. A generic calculator that outputs one supposedly “correct” fan size can give false confidence. Confirm the actual requirement for the property.