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How to estimate the amount of paint required for the interior walls of a home

CEILING

In order to get the ceiling measurement, measure the length and the width of the room and multiply those numbers together. This will give you the square footage of the ceiling. Once you have that number, then you divide the square footage by the manufacturer’s recommended amount of coverage per gallon. The end result will give you the amount of gallons required to paint the ceiling.

Interior Painting Dallas
Interior Painting

WALLS

In order to estimate the wall surfaces, it’s necessary to measure the length of each wall then add them together. Then you want to measure the height of the room. Multiply the entire perimeter of the room by the height of the room. The result will give you the overall footage of the room.

Once you have that number, you will then want to subtract 15 square feet for each window and 20 square feet for each door opening. This will give you a pretty solid number of the square footage of surface area that needs to be painted. Just like you did for the ceiling, you will then divide the square footage by the

amount of manufacturer’s recommended coverage per gallon. This will give you the amount of gallons required to paint the wall surfaces.

Residential Painting Dallas Texas
Residential Painting

CALCULATING TRIM

In order to estimate the trim, you’ll want to measure the length of the various trims, such as the baseboards, the door trim and the new crown molding, you do not want to add these things together. You will want to measure the width of each trim and multiply the width by the total length of that specific type of trim. When calculating trim, you need to convert the inches to the decimal system. So if it is three inches, it would be a quarter of a foot or .25. If it is six inches it would be .5 or half a foot. 

After calculating the trim, add 20 feet to the calculation for the trim that you want to use on around the doors. Do this for each door that is in the room. This will provide the total square footage of the trim. Once you have this number, divide the footage by the amount of coverage per gallon. This will give you the amount of gallons required to paint the trim. 

BUYING PAINT

We recommend that you use the highest square footage recommended by the paint manufacturers. If you do this, you will eliminate over-purchasing of the product. Keep in mind that manufacturers are in business to sell you as much paint as possible. Estimating the right amount of paint will prevent overbuying. You will need to take into consideration the number of coats you intend to apply to each surface, be it ceiling, walls, or trim. Making sure you buy paint and colors that are readily available will allow you to purchase more paint if you come up short while at that same time preventing over-buying as I mentioned before. 

Each paint will vary on coverage area depending upon its ability to cover the existing surface area, including paint currently on the walls, damaged or stained surfaces, rough textures, or other unpainted surfaces. 

Another thing to keep in mind is that when there is a huge color difference, the wall may require additional coats to cover the existing paint. Sometimes, we have to paint some walls as many as 3 times in order to completely cover the wall.

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