Paint Calculator
SolversPro Paint Calculator is a free home improvement estimation tool that calculates exact wall square footage, opening deductions, and gallon requirements for single and multi-coat room painting.
Paint Required
0 Gallons
Total Paintable Area
0 sq ft
*Assuming 1 gallon covers 350 sq ft of surface.
Wall Texture & Surface Coverage Reference
Standard spreading rates and primer recommendations across wall surface substrates:
| Substrate Surface | Coverage per Gallon | Dedicated Primer Needed | Recommended Sheen |
|---|---|---|---|
| Smooth Primed Drywall | 350 - 400 sq ft | Optional (if repainting similar tone) | Eggshell, Satin, Matte |
| Textured Wall (Orange Peel / Knockdown) | 275 - 325 sq ft | Yes (PVA primer on new mud) | Eggshell or Flat |
| Bare Plaster / Masonry Block | 200 - 250 sq ft | Required (Alkali-resistant sealer) | Masonry Acrylic / Elastomeric |
| Wood Trim, Baseboards & Doors | 350 - 400 sq ft | Required (Bonding primer on bare wood) | Semi-Gloss or High-Gloss |
Frequently Asked Questions
How many square feet does one gallon of paint cover?
A standard gallon of architectural interior paint typically covers 350 to 400 square feet on smooth, primed drywall. Textured walls, bare masonry, or porous unprimed plaster may reduce coverage to 250 to 300 square feet per gallon.
How do door and window deductions impact paint calculations?
Standard interior doors average 21 square feet (3 × 7 ft) and typical residential windows average 15 square feet (3 × 5 ft). Deducting these openings prevents purchasing excess paint.
Should I always plan for two coats of paint?
Yes. Even self-priming paints achieve uniform sheen, color saturation, and durability when applied in two separate coats, especially when transitioning between contrasting hues.
Does this calculation include ceilings or baseboards?
The default calculation models the four vertical room perimeter walls. If painting the ceiling, calculate room length × width separately using flat ceiling paint.
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