Paint Calculator

Calculate exactly how much paint you need for your room, including wall area calculation and paint coverage. Our free calculator helps you plan your painting project with precision, saving you time and money.

Calculate Paint Needed for Your Room

Area to Cover:

Windows & Doors:

Paint Coverage:

sq ft/gal (auto, depends on surface & paint type)

Price (optional):

Results

 

 

How to Calculate Paint Needed

Step 1: Measure Your Room

Calculate the total wall area by measuring the length and height of each wall. For rooms with standard 8-foot ceilings, multiply the perimeter by 8.

Step 2: Account for Windows and Doors

Subtract the area of windows and doors from the total wall area:

  • Windows: Small (15 sq ft), Medium (20 sq ft), Large (25 sq ft)
  • Doors: Standard door is 21 sq ft

Step 3: Consider Paint Coverage

Most paint covers 350-400 sq ft per gallon. Consider:

  • Number of coats needed (typically 2 coats)
  • Paint quality and coverage
  • Surface texture and porosity

Step 4: Calculate Total Paint Needed

The calculator will determine:

  • Total wall area in square feet
  • Area of windows and doors
  • Net wall area to be painted
  • Total paint needed in gallons