Paint Calculator for a 800 sq ft Home
Estimate gallons of paint for a 800 sq ft space.
A 800 sq ft home or space has roughly 2,000 sq ft of paintable wall area at 8 ft ceilings. That's about 6 gallons for one coat or 12 gallons for two coats — the standard for a color change. Buy an extra gallon per color for touch-ups. Enter your exact room dimensions below to get a precise gallon count.
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 of paint for 800 sq ft?
About 6 gallons for one coat or 12 gallons for two coats, based on ~350 sq ft of coverage per gallon and average 8 ft ceilings. Rough walls or dark-to-light color changes need more.
Does that include primer?
No — the gallon estimate is for finish paint only. If you're painting over new drywall, patches or a very different color, add 1 gallon of primer per 350 sq ft of wall area.
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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