One gallon of paint covers up to 400 square feet, which is enough to paint an average bathroom. A standard size room needs two to three gallon-cans of paint to cover between 800 and 1,200 square feet with two coats of paint. Paint Needed For A Room Room Size Coverage Area Gallons Average Bathroom 400 SF 1 Average Room 800 SF 2 Large Room 1,200 SF 3 Living Room or Several Average Rooms 1,600 SF 4
If you consider the price per gallon, which ranges between $25 and $50 for interior primers, $30 and $70 for interior paint, $30 and $60 for exterior primers, and $35 and $80 for exterior paint, a rough cost estimate for the primer and paint necessary to cover 2,000 square feet ranges from $300 to $650 for interior and from $350 to $750 for exterior surfaces.

If size determines the cost of an exterior paint job, is there a formula you can use to have a good idea on the cost? Well, some people say yes, but others say no. You can try, though! All you need to do is measure the square footage of your home’s exterior and multiply it by its height, from the roof line to the ground. Make sure to subtract windows and doors, and you can also subtract window trims if you plan on painting them in a different color.
When to use a high-gloss finish: Use this heavy-duty paint to highlight architectural details, decorative fixtures, accent trim, shutters, front doors, black metal railings, window frames, or anything else you touch on a regular basis.