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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.
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