Measure the space you are planning to paint. Measure each wall and the ceiling (if you are planning on painting it as well). Calculate the square footage by multiplying the length in feet times the height (length x height = area). And so a wall that measures 10 feet in length and 8 feet in height has an area of 80 square feet. To calculate the total square footage of a room, simply figure out the square footage of each wall and then add the totals together. A square room with four walls that are 10 feet in length and 8 feet in height would result in 320 total square feet for the room (80 square feet x 4 walls = 320 square feet).
Decide on the brand of paint you will use and determine the cost per gallon. The cost of a gallon of paint varies widely depending on brand and purpose. This will be a key factor in determining the overall cost of your painting project.
Determine how many gallons of paint you will need. One gallon of paint typically covers approximately 350 square feet. A wall that is 10 feet by 12 feet is 120 square feet (10 x 12 = 120 square feet). Divide 120 by 350 and you get .34. This means you will need about 1/3 gallon of paint for a single coat on this wall. Assuming you want to cover all four walls in this room and that the walls are similar in size, you will need approximately 1 1/3 gallon for a single coat of the entire room, or 2 2/3 gallons for two coats.
Determine the total cost of all additional supplies you will need to complete the paint job, such as primer, paint brushes, paint rollers, paint pans, cleaning supplies, tape and protective coverings for your furniture and the floor.
Add up the cost of paint (number of gallons needed multiplied by cost per gallon) and any additional supplies you need to discover the true cost of painting your interior space.
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