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For Walls
- Multiply
the perimeter (distance around room) by the height. If using a
different paint for door or window trim, subtract the square
footage of doors and window frames.
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For Ceilings Or Floors
-
Multiply the length of the room by its width. |
To determine how much paint you’ll need, divide the total
square footage by 400 since one gallon of paint covers
approximately 400 square feet. If using varnish or stain, divide
by 200 since one gallon of varnish or stain covers approximately
200 square feet.
Exterior Paint |
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For Siding Surface
-
Multiply the perimeter by the height.
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For Peak Areas
-
Multiply the height from base of roofline to tip of peak by
one-half the base length.
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For Total Square Foot Area
-
Add siding surface area and peak areas. For gutter, add 1 square
foot for every running foot. If using a different paint for
trim, subtract the square footage of doors and frames.
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To determine how much paint you’ll need, divide the total
square footage by 400.
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