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How to calculate square feet
To calculate an area in square feet, you will need measurements for the width and length (for a square shape) or the diameter (for a circular area). It may be that the area you're looking to measure is a strange shape (such as a room or garden). In this case, dividing it up into smaller parts and doing individual calculations is a good way to calculate the overall square footage.
Let's say you have a rectangularshaped room and you want to calculate the square footage area for flooring or carpet. The easiest method for calculating the square footage is to measure the length and width in feet and then multiply the two figures together to give you a result in ft^{2}. If you're measuring a room for flooring, take a look at our article on how to measure for a new floor.
Should you find yourself needing to calculate an area of square feet in an 'L' shape, consider dividing the shape up into rectangular sections and treating them as separate areas for calculation (adding them together at the end). For more instructions, see our full article: how to calculate square footage.
BUILDING TERRACES
Terraces are a pleasing way to build a taller retaining wall. Closely spaced terraces need to be reviewed by a qualified engineer to determine overall stability. Terraced walls should be analyzed as a complete wall system versus an individual wall, unless they are spread greater than twice the wall height of the lower or first wall and the soils are free draining and granular in nature.
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Paint Calculation Formula
Now that you’ve determined the room’s square footage, it’s a bit easier to figure out how much paint to buy. One gallon of paint typically covers 400 square feet with one coat of paint. Many wallpainting jobs require at least two coats of paint, especially if the new wall color is significantly different from the old. The paint calculation formula is as easy as determining how many gallons of paint are needed for one coat on the walls in the room. One gallon of paint is often enough for a tiny space such as a halfbath, while 2 gallons is enough to paint another coat or to paint a mediumsized room.
If the room has 500 square feet of wall space, for instance, buy 2 gallons of paint to apply one coat to the walls, which will leave enough left over for almost a full second coat.
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.
4. What is Net Cleanable Square Feet?
Net Cleanable Square Feet (“NCSF”) is the sum of all floor area that requires custodial services. NCSF is a great metric to know, especially for your facility’s custodial personnel. Having accurate NCSF measurements can help determine custodial staffing, inform budgeting and aid in service provider solicitation.
Custodial budgets will realistically contain chemicals, paper supplies, equipment and custodial labor costs to get the job done. Not knowing your facility’s true NCSF might mean that you are budgeting too little or too much for cleaning. If you want to learn more about custodial budgeting and planning for your facility teams, check out our free guide on creating a custodial cleaning plan.
How to Calculate Net Cleanable Square Feet
Determine the square footage of each room that needs to be cleaned. Areas that require no cleaning, such as closet areas and mechanical rooms, should not be included. Once you’ve gathered square footage (minus noncleanable areas) for all rooms, add them together. This number is your total square footage that needs to be cleaned.
You can take this process a step further and add cleaning costs to the equation. Multiply total cleanable square footage by a base price for cleaning. For instance, if your total area to be cleaned is 5,000 square feet and the price per square foot is 25 cents, you can multiply $0.25 times 5,000 to get a total of $1,250 for cleaning fees.
DETERMINE YOUR WALL LAYOUT
Here is a sample wall profile. If your wall height varies, divide the wall panels into segments according to height. This will assist in effectively calculating the square footage, as well as eliminate excess materials. (See the Front View, Side View, and Overhead view drawings below).
How to figure square footage of a wall?
It doesn’t matter whether you’re thinking how to calculate wall square footage for paint or for wallpaper – it’s the same. Use these pieces of advise to improve your ability to figure out the square feet of your wall:
Precise measurement is the key 🔑 – no matter if you’re using the wall sq ft calculator or computing everything yourself:

Start with drawing a plan of your room/house – it’ll make it easier to measure and store data;

Alway use the proper equipment – a steel tape measure or a yardstick;

Measure the length of your walls, including both doors and windows; and

Determine the height of your walls – measure them from the floor to ceiling. Exclude the length of a dropped ceiling or moulding (coving).
It’s math time! Let’s find out how to calculate the square feet of a wall.
So how do we calculate the square feet of a wall? The equation is simple:
walls square footage = total length of the walls * ceiling height
But how to calculate sq ft of a wall with doors and windows? 🤔
corrected wall square footage = wall square footage  windows area * number of windows  door area * number of doors
Now it’s time to figure out the square feet of windows and doors – take a look at the standard sizes, presented in the table below:
Windows  3 x 4 ft  12 ft² 
Doors  3 x 7 ft  21 ft² 
That’s how to calculate square feet of a wall. Are you still at the beginning of your journey, not yet sure about the number of planned doors and windows? Try our basic construction calculators:
 Find out how to deal with wood & steel framing;
 Estimate the amount of drywall you’ll need;
 Dreaming big? Try the concrete block wall calculator or the brick calculator 🧱
Square feet to cubic feet
If you would like to convert your square footage into cubic feet, take a look at the square feet to cubic feet calculator.