Room Specifications
Input your floor footprint length, width, and openings count configurations.
Painting Specifications:
Total Net Wall Area:
0 sq ft
0 sq ft
Liquid Paint Required:
0 Gallons
0 Gallons
Find paintable flat surface boundaries and raw liquid consumption profiles instantly.
Input your floor footprint length, width, and openings count configurations.
To accurately find the physical surface spread for an interior coating project, you must isolate wall perimeters while subtracting raw gaps created by utility openings:
Calculations assume standard distribution spreads: One standard gallon of paint spreads across roughly 350 square feet of primed drywall surface material context.
Calculating paint requirements depends on matching the structural surface area against the fluid absorption profile of your target material. Unprimed porous elements like raw plaster, exterior brick, or new drywall pull fluid deeply into their cores, requiring significantly more product than previously sealed surfaces.
Find the total wall area by multiplying Wall Height × Total Wall Perimeter length. Subtract major open spaces like windows (approx 15 sq ft each) and doors (approx 21 sq ft each). Divide the net area by your paint's rated coverage factor.
Always assume a minimum of two full coats for uniform color depth. Raw walls require a base coat of dedicated primer, which saves money by keeping your premium tinted topcoats from soaking into the substrate.
| Substrate Surface Material | Average Coverage per Gallon | Porosity Rating Profile |
|---|---|---|
| Primed Drywall / Smooth Wood | 350 - 400 Square Feet | Low Porosity (Optimal Yield) |
| Rough Brick, Concrete, or Stucco | 100 - 150 Square Feet | High Porosity (Requires Primer Base) |