1. Multiply the length of the door by the width of the door to calculate the square footage of one side of the door
Door Length X Door Width = Square Footage of One Side of Door
2. Multiply the square footage of one side of the door by 2 to determine the square footage of both sides of the door
Square Footage of One Side of Door X 2 = Square Footage of Both Sides of Door
3. Multiply the square footage of both sides of the door by 2 to determine the square footage for 2 coats of paint (2 coats is always recommended)
Square Footage of Both Sides of Door X 2 = Square Footage for 2 Coats of Paint
(IF THE DOOR HAS WINDOWS THEN CONTINUE TO STEP 4)
4. If the door has a window, multiply the length of the window by the width of the window to calculate the square footage of one side of the window
Length of Window X Width of Window = Square Footage of One Side of Window
5. Multiply the square footage of one side of the window by 2 to calculate the square footage of both sides of the window
Square Footage of One Side of Window X 2 = Square Footage of Both Sides of Window
6. Subtract the square footage of both sides of the window from the square footage for 2 coats of paint to calculate square footage for 2 coats of paint of door with window
Square Footage for 2 coats of paint - Square Footage of Both Sides of window = Square Footage of 2 Coats of Paint for Door With Window
(IF A DOOR HAS MUTLIPLE WINDOWS THEN COMPLETE STEPS 4-6 FOR EACH WINDOW)