Paint Every Room,
Never Stop One Wall Short.
Free painting calculators: gallons of paint for any room, full project cost, ceiling and trim coverage, and how long the job takes.
Door & Window Deductions
Automatically subtracts standard 21 sq ft door and 15 sq ft window openings from wall totals.
Two-Coat True Coverage
Factor in raw drywall primer thirst (250 sq ft/gal) vs second finish topcoat spreading rates.
Trim & Ceiling Separation
Keep ceiling flat whites and baseboard semi-gloss gallons cleanly separated from wall colors.
PaintCalc Calculators
Paint Gallons Calculator
Gallons of paint for a room — wall area minus doors and windows, multiplied by coats, divided by honest coverage.
Paint Project Cost Calculator
The full project cost: paint by tier, primer, rollers and brushes, tape and drop cloths, and the hardware-store tax of forgetting them.
Ceiling & Trim Paint Calculator
Ceiling area, trim linear feet, and the separate gallons each needs — because ceilings and trim never share a can.
Painting Time Calculator
Real hours per room: prep, cutting in, rolling, and dry-time windows — scheduled as the two-day job it actually is.
Building Code & Methodology
The five supplies that decide whether your paint job looks professional
Roller nap, brush quality, tape, light, and patience at the cut-in line.
Primer: when it earns its coat and when it is a upsell
The four situations that genuinely need primer, and the two where you can skip it.
12 mistakes people make with painting projects
The recurring errors we see in painting projects — what causes each one, and the habit that prevents it.