Skip to content
2xKit

Room/Wall Area Calculator

Calculate a room's floor area and net wall area after subtracting doors and windows.

Formula v1.0.0GlobalMethodologyroom-wall-area-v1
How this is calculated
Gross wall area = 2 × (length + width) × height; Net wall area = Gross − openings

About this calculator

The room/wall area calculator computes floor area and gross wall area (perimeter × height) from room dimensions, then subtracts the area of doors and windows to give the net wall area you'll actually paint or tile.

Worked example

12ft × 10ft room, 10ft height, 40 sqft of openings

Result: Net wall area = 400 sqft

Was this helpful?

Related calculators

Paint Quantity Calculator

Estimate how much paint you need for a wall area.

Plaster Quantity Calculator

Calculate cement and sand needed for wall plastering.