How To Calculate Square Footage For Painting Walls. Then subtract the square footage of any windows or doors to arrive at total square feet of wall needing paint. Enter measurements in us or metric units.
Windows average 15 square feet (there are two in this example):
The square footage calculator is a super tool for calculating the square footage of a room. Enter measurements in us or metric units. L x w = a (in square feet). When painting a house, installing flooring, or building a home, the square footage of the property is often used to determine cost or materials to be.