Figuring Out The Square Area Of A Wall Before Buying Paint

If you’re about to spruce up your walls with a fresh coat of paint before selling an Angel Fire home, it’s easy to figure out how much paint you will need by determining the approximate square footage of the walls. See, one gallon of paint will cover around 300 to 400 square feet. So, all you need to do is figure out the surface area of the room you’re painting. You’ll need a tape measure.

To determine the surface area, measure the length and height of each wall. Multiply the height by the length. For example, if a room is 20 feet long and 8 feet tall, simply multiply 20 by 8 to get the surface area of that one wall. The surface area of this example is 160 square feet. Do this for each wall and then add all of the areas together. For our example, let’s say that the opposite wall is the same size. Then let’s say the other two walls are 15 feet long and 8 feet tall. You multiply 15 by 8 to get 120 square feet. When you add all of the walls together, you get a total of 560 square feet. So, in this example, you’d want to get at least two gallons of paint.

What If The Ceiling Is At An Angle?

If you have an angled ceiling, you just need to make an adjustment, by imagining that the area above what would have been an otherwise flat ceiling is a triangle. Let’s do another example. We’ll say that one side of the wall is still 8 feet tall, but the other side measures 12 feet tall and it’s still 20 feet long. You will figure out two areas for this wall. One is the square that we found in the first example and the other area is a right triangle.

Figuring Out The Area Of A Right Triangle

There are many calculators online for figuring out the area of a right triangle if you know the length of two sides and one angle. In our example, we do know one angle, because the area is a right triangle. With right triangles, one angle is always 90 degrees. We already know that the length of the wall is 20 feet, so that’s one side of the right triangle right there. So, let’s figure out the other side. Since the tall side of the wall is 12 feet tall and the short side of the wall is 8 feet tall, the height of the triangle we are measuring would be the difference between the two (12-8=4). So, to determine the area of the triangle, we use the following data: Side a= 4 feet. Side b= 20 feet. Angle A= 90 degrees. The calculator will show you that the triangle we made has an area of 40 square feet.

That means that this wall has a combined area of 200 square feet and our opposite wall would also have an area of 200 square feet.

Now, we simply go in and determine the height of the tall wall, since the short wall that is opposite the 12 foot tall wall is the same size as it was in our first example.

So, now you simple add all of these areas together:

160sq ft+ 40 sq feet + 160sq ft+ 40 sq feet + 180 sq ft + 120 sq ft = 700 sq feet. This means you could need three gallons of paint.

If you have large doors or windows, you can just subtract the area of the window or door from the total area.


If you’re interested in moving to or within Northern New Mexico, contact Coldwell Banker Headin’ Home Realty for all the best listings and most up-to-date information. We are your Angel Fire area experts. Our talented, helpful real estate agents in Angel Fire specialize in residential homes, commercial buildings, condos, vacant lots, and ski properties. We’d love to help you find property with ski in ski out access in the Angel Fire, Eagle Nest, Red River, Mora, Colfax County, Taos, and the Taos Ski Valley areas.

Reach us by telephone at 1-575-377-1192 or by email. Check out our online listings from the comfort of your home. View virtual tours of Angel Fire real estate. You can also just swing in and see us! We are located right in the heart of Angel Fire, in the Mountain View Mall next to Lowes Grocery Store.

Don’t forget to find us on Facebook for the latest information on Angel Fire property listings! So, whether you are looking for ski property, land, or a mountain home, we are eager to help make your dreams come true!

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