To figure out how much a paint job will cost, or how much you plan to charge, you need to know the rough size of the home or room you're painting. You can find this somewhere in the paperwork you signed when buying or renting your home. If you're painting for someone else, ask them for the information.However, if you don't have that information on hand, use a ruler or tape measure to measure the length and width of the home/room. You can enter this into an online calculator to determine the rough square footage.;
, Not every inch of a home or room will be painted, so subtract as necessary. Doors and windows will likely not be painted, so measure these areas and subtract their measurements from the total square footage.As a general estimate, you can subtract about 20 square feet per door and 15 square feet per window. Say a 700 square foot room has one door and two windows. You would subtract 20 for the door, and 30 for the window, resulting in a square footage of 650.
 A gallon of paint covers 350 square feet. So, a room that's 650 square feet would need roughly two gallons of paint because 650 divided by 350 comes out to about 1.8. However, you usually need two coats, so expect to buy around four gallons of paint for a room of this size., Once you've determined how much paint you need, figure out how much your paint will cost. Paint costs vary depending on factors like color and quality. Paint is generally $20 to $40 per gallon, with higher quality paint costing more.Say you want two coats of a decent quality paint for a 650 square foot room, which requires four gallons of paint. If you plan to buy paint at $30 a gallon, expect to pay around $120 for paint.
 What supplies do you have and what supplies do you need to buy? You will likely need masking plastic, masking paper, paint tape, caulking, and a gallon of primer.Find the average cost of these supplies by visiting local suppliers and adding up the total.
For example, say the masking plastic costs $25, the masking paper costs $15, the tape costs $10, the caulking costs $15, and the primer costs $20. This means cost of supplies is around $115.
Measure the home or room.
Subtract areas that won't be painted.
Determine how much paint you need.
Figure out the cost of paint.
Determine the cost of materials.
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