Paint Calculator for a Living Room
Estimate gallons of paint for a living room.
Use this free paint calculator to estimate how many gallons you need for any room. Enter the room’s length, width, ceiling height, number of doors and windows, and number of coats. The calculator subtracts door and window areas, calculates the paintable wall area, and estimates gallons based on 350 ft² of coverage per gallon.
Gallons
1.81
Buy the next whole gallon
Paintable area
316 ft²
Total wall area
352 ft²
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How does the paint calculator work?
Wall area is the room perimeter × ceiling height. Subtract roughly 21 ft² per door and 15 ft² per average window, then multiply by the number of coats and divide by 350 ft²/gallon.
Formula: gallons = ((2(L+W) × H − doors×21 − windows×15) × coats) ÷ 350
What else do people ask about this calculator?
How many gallons for a 20x15 living room?
A 20×15 ft living room with 9 ft ceilings has roughly 570 sq ft of wall (minus openings). That's 2 gallons for one coat or 3–4 gallons for two coats.
What paint finish is best for a living room?
Eggshell or satin is the standard — they hide minor wall imperfections while being washable enough to wipe down. Save flat/matte for ceilings and bedrooms.
How much paint do I need for a 12×12 room?
A 12×12 room with 8 ft ceilings, 1 door and 1 window needs about 2 gallons for two coats.
How much does a gallon of paint cover?
About 350 ft² per gallon on smooth interior walls. Textured or porous surfaces reduce coverage to 250–300 ft².
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Weights, coverage, types and buying tips for the materials this calculator estimates.
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