PAINT CALCULATORS
How much paint do I need?
Free paint calculators for every surface, room, and project type. Pick a calculator below, enter your dimensions, and get exact gallons + a Kompozit shopping plan with prices.
SURFACE
Pick by what you're painting
Interior walls
Walls, ceiling, doors, windows
Exterior
Siding, trim, garage doors
Single wall / accent
One wall, no perimeter math
Kitchen cabinets
Linear-foot math, semi-gloss
Doors
Interior + exterior, 7 types
Trim & baseboard
Crown, casing, chair rail
Deck stain
Transparent, semi, solid, deckover
Fence
Wood, metal, vinyl — both sides
Concrete & garage floor
Garage paint, porch, granite-grip
Epoxy floor
2-part epoxy + acrylic comparison
Roof
Metal, asphalt, concrete
Stucco
Fine, medium, heavy texture
Brick
Smooth, rough, limewash
Pool
Epoxy, rubber, acrylic
Spray paint cans
4.5, 12, 16 oz
Primer
All surfaces — drywall to metal
Whole house
Interior + exterior + trim
Cost calculator
Paint + supplies + labor
BY ROOM
Pick the room you're painting
Bedroom
12 × 11 ft typical · eggshell finish
Master Bedroom
16 × 14 ft typical · eggshell finish
Bathroom
8 × 6 ft typical · satin finish
Kitchen
14 × 12 ft typical · satin finish
Living Room
16 × 14 ft typical · eggshell finish
Dining Room
12 × 12 ft typical · eggshell finish
Hallway
4 × 15 ft typical · satin finish
Nursery
10 × 10 ft typical · eggshell finish
Home Office
10 × 12 ft typical · eggshell finish
Basement
24 × 20 ft typical · eggshell finish
Garage
22 × 20 ft typical · satin finish
BY ROOM SIZE
Quick lookup by room dimensions
8 × 10 ft
walk-in closet
10 × 10 ft
small bedroom
10 × 12 ft
guest bedroom
11 × 12 ft
standard bedroom
12 × 12 ft
standard bedroom
12 × 14 ft
medium bedroom
12 × 15 ft
medium primary bedroom
12 × 16 ft
primary bedroom
14 × 14 ft
family room
14 × 16 ft
large primary bedroom
15 × 15 ft
large bedroom
16 × 16 ft
living room
16 × 18 ft
large living room
16 × 20 ft
great room
20 × 20 ft
great room
20 × 24 ft
large great room
BY PROPERTY TYPE
Apartment, mobile home, barn, shed
Apartment
Default 1600 sq ft total
Mobile Home
Default 4000 sq ft total
Shed
Default 250 sq ft total
Barn
Default 5000 sq ft total
BY SIDING TYPE
Vinyl, cedar, T1-11, aluminum
Vinyl Siding
~250 sq ft/gal
Cedar Siding
~250 sq ft/gal
T1-11 Siding
~225 sq ft/gal
Aluminum Siding
~350 sq ft/gal
SPECIALTY
Refinishing, sealers, decisions
Bathtub refinishing
Epoxy kit sizing
Furniture refinishing
Per-piece estimates
Driveway sealer
Asphalt + concrete
Asphalt sealer
Parking lots, large surfaces
Basement waterproofing
Masonry waterproof paint
Drying time
Recoat + cure by temp/humidity
How many coats
1, 2, or 3 coats decision tool
HOW THE CALCULATOR WORKS
The math is the same everywhere
gallons = (paintable_area × coats) / coverage_rate
Coverage rates differ by paint type — premium interior covers ~388 sq ft/gal, exterior ~350, stucco ~225, concrete ~225, stains 150–200 depending on transparency, waterproofing paint as low as 75. We round up to the nearest quart and recommend Kompozit products with verified coverage from the manufacturer. Prices come live from kompozitusa.com.