Paint Calculator
Calculate how much paint you need for your walls, rooms, or entire house
Room Dimensions
Typical coverage: 350-400 ft² per gallon
Paint Needed
0
Gallons
Based on 2 coats
Area Breakdown
Total Wall Area0 ft²
Paintable Area0 ft²
Coverage Rate0 ft²/gal
Buying Tips
- • Always buy slightly more than calculated
- • Consider buying an extra gallon for touch-ups
- • Darker colors may need more coats
- • Textured walls use 10-20% more paint
How to Calculate Paint Needed
Calculation Method
- 1Calculate wall area: Multiply length × height for each wall and add them together
- 2Subtract openings: Deduct area for doors (21 sq ft) and windows (15 sq ft)
- 3Multiply by coats: Multiply paintable area by number of coats needed
- 4Divide by coverage: Divide by paint coverage (typically 350 sq ft per gallon)
Important Factors
Paint Quality
Premium paints often have better coverage than budget options
Surface Texture
Rough or porous surfaces absorb more paint
Color Change
Going from dark to light colors may require a primer coat
Application Method
Spraying uses 20-30% more paint than rolling
Professional Painting Tips
Preparation
- • Clean walls before painting
- • Fill holes and sand smooth
- • Use primer on new drywall
- • Tape edges carefully
Application
- • Use quality brushes and rollers
- • Cut in edges first
- • Apply thin, even coats
- • Allow proper drying time
Efficiency
- • Buy paint in larger quantities
- • Keep leftover paint for touch-ups
- • Label paint cans with room names
- • Store paint properly for longevity
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