Calculate paint quantity needed for walls, coverage area, and painting projects.
Understanding paint coverage and project planning. Paint coverage varies by type: interior latex 350-400 sq ft/gallon (11-13 m²/liter), oil-based lower (10-11 m²/liter), primer 350-400 sq ft/gallon, specialty paints vary. Wall preparation affects coverage: smooth surfaces require less paint, textured or porous require more. Multiple coats common: first coat primer (if needed), 1-2 finish coats. Dark colors covering light surfaces require extra coats. Light colors covering dark surfaces require extra coats.
Surface condition affects coverage: previously painted surfaces use less than bare drywall. Drywall sealing: new drywall absorbs paint, requires primer ensuring even coverage. Woodwork often requires 2 coats minimum, trim typically 2 coats. Ceilings: horizontal surfaces difficult to paint, often light color, coverage affected by light absorption. Texture: knockdown, popcorn texture reduce visible surface area coverage. Sheen affects appearance: flat/matte (hides imperfections, less durable), eggshell (slight sheen, more durable), satin (moderate sheen), semi-gloss (high shine, very durable).
Moisture areas: bathrooms, kitchens require mildew-resistant paint. Exterior painting: weather-resistant, UV-resistant paints, shorter repainting intervals (5-10 years). Budgeting: quantity requirements determine cost, waste allowance (typically 10%). VOCs (volatile organic compounds): lower VOC products healthier for indoor air quality. Climate considerations: temperature, humidity affect drying time and application. Professional painters charge labor (hours × hourly rate) plus materials. Understanding coverage enables accurate material estimation, budget planning, and successful project execution..