How to calculate square feet of a wall in inches

How to calculate square footage? 

It's easy.  Follow these steps.

Measure the length in feet, Measure the width in feet. Multiply the length figure by the width figure.  This will be your total square footage for that portion of your project.  Continue to repeat this for all parts of the space that will get the same tile.   Add these together for your total square footage.

Measuring in inches works as well.  Do the math the same way, then divide by 144 to get your total in square feet.
When calculating square footage account for the entire space (i.e. under vanity/cabinets).

How much to allow for waste?

To allow for waste, you must consider the installation.  For most standard installations, 10% extra for waste is sufficient.  Percentage of waste for more elaborate patterns like running tile on a 45 degree angle, herringbone or cross hatch, consult with your installer. Add 15% for tile being installed in a room with lots of jogs and corners. These installations will require more cuts and thus more waste.

Length x Width + Waste = Amount Needed

How to measure for bullnose?

Measure the length of any outside edge where your tile edge would be exposed or you want framed out.  Bullnose (also called trim pieces and decorative tiles) are typically sold by the piece. To figure the quantity you have to establish the length of the trim piece (i.e. 6" bullnose, 8" decorative liner), then the rule is:  Your total linear length divided by the length of each piece equals your quantity needed.  

How to calculate how many pieces of bullnose you will need?

If you have ten feet exposed edge that needs bullnose this is equal to 120".  If you selected a 6" bullnose or trim piece, you will need to divide 120" by 6", which will give you 20 pieces of bullnose needed.  Using 8" decorative liner for the same 120", you divide 120" by 8" which would be 15 pieces of liner needed.

Measuring for Schluter Profile Edging

Measure the length of any outside edge where your tile edge would be exposed.    Not all edging is the same.  Speak to your design associate about different uses.  

Unless you are a current or future scientist, a construction worker or a surveyor, you can probably go about your daily business without worrying too much about measuring the area of things. You might overhear that the pressure is such-and-such "per square inch," or that a certain kind of carpet costs a given amount "per square foot," but not stop to consider the matter — pardon the pun — at length.

It is handy, however, to be able to work with common length units (e.g., inches, feet, yards, centimeters and meters) and work between them while moving from the single dimension of length to two-dimensional area. To convert inches to square feet, first recognize that you have different units in play and assess exactly what you're hoping to do or learn with your conversion.

What Are Inches and Feet, Anyway?

An inch was originally defined centuries ago in Europe as the width of an adult male's thumb, but this became the width of three pieces of barleycorn placed side by side. The foot's origins are what you would probably expect — the approximate length of a man's foot. The Romans first introduced the 12-inch foot to England in the first century CE.

Today, an inch is, ironically enough, defined precisely in terms of metric units, translating to 25.4 millimeters (mm). Correspondingly, a foot is now defined as 12 times 25.4 mm = 304.8 mm exactly.

Length in Two Dimensions: Area

Different two-dimensional shapes have different formulas for area, which is the size of a closed region of a plane (an idealized flat surface). The formula for the area of a rectangle is length times width, usually expressed as (l × w). The formulas for other regular shapes, such as circles and various kinds of triangles, are more complex, but just as reliable.

Length in Three Dimensions: Volume

In the case of extending your measurement by one more dimension, you add depth, height or some third direction that is mutually perpendicular to the other two. The multiplication of these three parameters gives the volume of the three-dimensional enclosed space.

The formula for a rectangular box, for example, is length times width times height, or (l × w × h). Formulas for spheres, pyramids, cones and more have shepherded many a geometry student through quizzes and exams.

How to Convert Inches to Square Feet

If you have a rectangular surface and know the width and the length in inches, you can find the area in square feet in a couple of different ways.

The first is to find the area in square inches and convert this directly to square feet. This is done by dividing by 144. The reason is because 1 ft = 12 in, (1 ft)2 = (12 in)2 = 144 in2. A second way is to convert both the length and the width to feet by dividing each by 12, and then multiply these together to attain the same result.

Example: Given a table 48 in. long and 30 in. wide, what is its area in square feet?

Method 1:
(48)(30) = 1,440 in2 1,440 in2/(144 in2/ft2) = 10 ft2

Method 2:
(48 in/[12 in/ft])(30 in/[12 in/ft]) = (4)(2.5) ft2 = 10 ft2

In general, method 1 is better when working with relatively low numbers. For example, a swatch of fabric 4 inches wide and 10 inches long is 40 square inches; dividing this into 144 gives 0.273 ft2. Using method 2 in this case would result in the multiplication of two decimal numbers with a value less than 1.0 to achieve the same answer.

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