Paint & Primer Coverage Calculator – Wanjaaro Material & Cost Calculator
Estimate gallons of wall/ceiling paint and primer with window and door deduction. Free, instant deterministic calculations with waste margin, material takeoffs, and contractor cost breakdown.
Category: Drywall & Paint
Last Modified: 2026-10-07
Available Building Material Calculators
- Concrete Slab & Footing Calculator – Calculate volume in cubic yards, pre-mixed bags (40, 60, 80 lb), and rebar grid requirements.
- Brick & Mortar Calculator – Calculate total modular, king, or queen bricks, mortar bags (Type N/S), and tons of sand.
- Concrete Block (CMU) Calculator – Estimate standard CMU blocks, core-fill grout volume, mortar bags, and vertical rebar.
- Wall Framing & Stud Calculator – Calculate common studs, double top plates, bottom sill, headers, corners, and board feet.
- Plywood & OSB Sheathing Calculator – Determine 4x8 / 4x10 sheets for walls, subfloors, and roof decks plus framing nail counts.
- Drywall & Sheetrock Calculator – Calculate 4x8, 4x10, 4x12 drywall sheets, joint compound buckets, screws, and tape rolls.
- Paint & Primer Coverage Calculator – Estimate gallons of wall/ceiling paint and primer with window and door deduction.
- Roofing Shingle & Pitch Calculator – Calculate roofing squares, architectural bundles, pitch multipliers, felt, and ridge caps.
- Tile, Grout & Flooring Calculator – Calculate square footage, tile boxes with waste, grout weight (lbs), and thin-set bags.
- Construction Cost & Budget Estimator – Estimate total project budget with material subtotal, labor rates, GC markup, and contingency.
Frequently Asked Questions
How many square feet does one gallon of paint cover?
A standard gallon of quality architectural interior acrylic latex covers approximately 350 to 400 square feet on smooth, primed surfaces. On rough, unprimed drywall or masonry, coverage drops to 200 to 250 square feet per gallon.
Why is a dedicated primer coat necessary on fresh drywall?
New drywall paper and joint compound absorb paint at vastly different rates (called "flashing" or banding). A PVA drywall primer seals the porosity evenly, guaranteeing uniform sheen and color.