CONSTRUCTION
Wall Area with Openings
Net wall area for painting or papering: rooms with length, width and height, openings by room with counts, optional ceilings, and quantity from your coverage.
Gross wall area, openings, net area per room and in total, ceiling area, the waste-adjusted total, and the product quantity from your coverage and number of coats.
Example: Living 5.2 × 4.1 × 2.4 m less a door and two windows, Bedroom 4 × 3.5 × 2.4 less a door: gross 80.6 m², openings 7.4 m², net 73.3 m²; with 10 % waste and two coats at 10 m²/L that is 16.1 L.
Loading the workspace…
BUILT TO BE UNDERSTOOD
What Wall Area with Openings assumes.
No black-box numbers.
How the result is calculated
Describe the formula and its source.
What this utility does not do
State the limits plainly.
SOURCES
- Gross = 2(L + W) × H; net = gross − Σ(width × height × count); ceiling = L × W when included; quantity = net × (1 + waste) × coats ÷ coverage
Last reviewed 21 September 2026. How results are checked: How we verify.