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One gallon of paint covers approximately 400 square feet.
To estimate how much paint your project requires, enter your
room measurements—rounded to the nearest foot—into
our pop-up calculator. To ensure you will have enough paint,
do not worry about excluding areas not to be painted, such
as windows and doors. Additionally, a 10 percent waste Allowance
is automatically added to the total.
Tips on Measuring for Paint
Before you begin, take the room measurements in the list
below. If you have cathedral ceilings that create sloping
walls, follow the special case instructions on how to derive
this square footage.
1. Wall height
Measure from floor to ceiling.
2. Wall perimeter for areas you plan to paint
Measure the length of each wall. Add all these figures together
to obtain the total horizontal distance, or perimeter.
3. Ceiling width and length
Omit if you do not plan to paint your ceiling.
4. Sloping walls form a triangular wall space
To calculate a triangle’s square footage, multiply the
length or base of the wall by the highest wall height and
divide by 2.