When my wife and I moved into our new home, we wanted to paint the walls before moving in the furniture. My wife has some vision, so she measured the rooms and we went to our local hardware store to purchase the paint. We knew what color we wanted, but we had no idea how much paint it would take to paint our house.
While searching the net, I found this paint calculator. I wasn't looking for a paint calculator at the time, but I thought there may be someone out there who is getting ready to move and may have use for it, so here's how it works.
You first take the measurements of the room you want to paint. This means the length, width and height of the walls, as well as, how many doors and windows there are with their measurements too. Then you put that information into the calculator along with how many square feet a gallon of the paint you want to use covers (this information is usually provided on the can). Then click Calculate.
You'll then find out how many gallons you need in the totals area. (Visually impaired folks will notice it is darker gray around this area to attract your eye to the total!) They give you the disclaimer that you should do your own measurements and check with a professional, because this is just a rough measurement. It will help you get an idea of how much money it will cost to get the job done.
Click this link to use the Paint Calculator.