DIY Wall Paint Calculator

To determine how much paint to buy for your DIY job (if you're in a country that's adopted the metric system), find the square meterage of the area you plan to paint and divide by the number of square metres covered by a litre of paint.

• Total wall area: Total length of all walls x wall height

  
  



• Unpainted areas:

  
  
  
  

  • Window area = window height x window width x number of windows

    
    
  
  

  • Door area = door height x door width x number of doors

    
    
  
  
  
  



• Paintable wall area: Total wall area – window area – door area

  
  



• Paint to order:

  
  
  
  

  • Paintable area 1500 = number of litres needed for smooth walls

    
    
  
  

  • Paintable area 1350 = number of litres needed for rough, textured walls or unpainted wallboard

    
    
  
  
  
  

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Source:http://www.dummies.com/how-to/content/diy-wall-paint-calculator.html