How much will a gallon of paint cover?
Coverage depends on so many factors that it is difficult to generalize. Some factors affecting coverage are the climate of the area (i.e. humidity and heat), the porosity of the surface getting painted (i.e. wood, stucco, or metal), the type of paint (oil, water, etc.), and the method of application (roller, brush, sprayer, etc.). Additionally, the texture of the surface will dictate how much paint it will need. For instance, stucco will need a lot of paint because it is very rough and extremely porous.