Content of the material
 Calculator Use
 Video
 How many square feet is a 12×12 room?
 How to find the square footage of a rectangle
 Convert among square inch, square foot, square yard and square meter
 How much to allow for waste?
 What to leave out
 How to calculate the square feet of a room?
 How to calculate how many pieces of bullnose you will need?
 Square feet: Calculating the length and breath
 FAQs
Calculator Use
Use this calculator to find the square footage, square inches, square yardage, square meters or acres for a building, home, garden or construction project. Calculate square footage, inches, yardage, meters and acres for landscape, flooring, carpet, or tiling projects to estimate area and the amount of material you will need. Also calculate the cost of materials when you enter the price per square foot, price per square inch, price per square yard or price per square meter.
Price is entered in the fields, for example, as $ price: 3.00 per: 1 square unit: foot (ft²) meaning $3.00 per 1 square foot or $ price: 25.00 per: 1000 square unit: foot (ft²) meaning $25.00 per 1000 square feet etc ….
If you want to calculate volume of bulk materials such as mulch or gravel you should use our calculator for cubic yards and cubic meters.
Enter measurements in US units or metric units. Calculate area from your measurements in inches (in), feet (ft), yards (yd), millimeters (mm), centimeters (cm), or meters (m). You can also enter decimal values. For example, if you have one measurement that is 7’3" you can enter that as 7.25 feet (3"/12" = 0.25 ft). If you have a measurement of 245 cm you can also enter that as 2.45 m.
How many square feet is a 12×12 room?
The square footage of a room measuring 12 feet wide by 12 feet long is 144 square feet. To calculate this you simply multiply the width by the height. 12ft × 12ft = 144 sq ft.
Video
How to find the square footage of a rectangle
 Measure the width and length of the area in feet.
 Multiply your length and width together to get your area.
Note: If your measurements aren't in feet, convert them to feet first using our length converter.
Once you've carried out your calculation, you will have your square feet (ft^{2}) figure. To calculate your cost of materials, simply multiply this figure by your price per square foot.
Convert among square inch, square foot, square yard and square meter
You could, for example, perform all of your measurements in inches or centimeters, calculate area in square inches or square centimeters then convert your final answer to the unit you need such as square feet or square meters.
To convert among square feet, yards and meters use the following conversion factors. For other units use our calculator for area conversions.
 Square Feet to Square Inches
 multiply ft^{2} by 144 to get in^{2}
 Square Feet to Square Yards
 multiply ft^{2} by 0.11111 to get yd^{2}
 Square Feet to Square Meters
 multiply ft^{2} by 0.092903 to get m^{2}
 Square Yards to Square Feet
 multiply yd^{2} by 9 to get ft^{2}
 Square Yards to Square Meters
 multiply yd^{2} by 0.836127 to get m^{2}
 Square Meters to Square Inches
 multiply m^{2} by 1,550 to get in^{2}
 Square Meters to Square Feet
 multiply m^{2} by 10.7639 to get ft^{2}
 Square Meters to Square Yards
 multiply m^{2} by 1.19599 to get yd^{2}
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
What to leave out
A good rule of thumb to ensure you’re taking proper measurements is to exclude space you can’t walk on or live in. These types of spaces do not count as “gross living area.”
“Someone might think, ‘If I get the measurement of my first floor and I have a twostory house, I just multiply that by two,’” Day says. However, if that first floor includes a twostory foyer, you can’t count the nonusable space.
Basements and garages, even if they are finished, don’t generally count toward total square footage. Basements are typically excluded because they are built below grade, meaning below ground level. If your state does allow basements to be included in the total square footage of a home, though, you’ll likely need an ingress and egress, or a safe way to enter and exit the basement to the outside.
Finished attic spaces — with some regulations, including ceiling heights — can count toward the total square footage of your home. If you are planning to sell your home, work with a real estate agent to craft a listing that accurately reflects your property.
How to calculate the square feet of a room?
If you’re wondering how to do square foot calculations, you first need to measure two dimensions: the length and the width.
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.
Square feet: Calculating the length and breath
If you’re wondering how to measure square feet, just follow the steps below:
Step 1 To determine the length, start by measuring the longest side. Fix one end of the tape measure to one end of the longest side. Make a note of the measurement. Step 2 Then, measure the width of the area to be determined, which is the shortest side. Repeat the steps above and take note of the result.
FAQs

Every appraiser has their own preferred method of calculating the square footage of a home. Some use a tape measure to carefully take the dimensions of each room, whereas others use a laser device that eliminates manual measuring. For difficulttomeasure spaces, experienced pros may just eyeball it. As a result, different appraisers will often come up with a slightly different square footage of the same home.

There are lots of reliable square footage calculators online, including examples from Calculator Soup, the Calculator Site or . Many can calculate price per square foot as well.

To calculate the square footage of a roof, start by measuring the length and width of every roof surface, including dormers. Then, multiply the length and width of each rectangular section of roof to find the area. If there are triangular sections of roof, calculate the area by multiplying the length of the triangle’s longest side by its height, and divide by two. The last step is to add up the area of all roof planes to get the total square footage of the roof.

You can calculate the square footage of a triangular room by measuring the base of the triangle, which is the length of the longest wall. Then, measure the height to the top of the triangle. Multiply the base and height together, and divide by two to get the square footage of the room.

Closets are often included in the square footage of a home, but not always. Any space inside a home that has walls, a floor, a ceiling and heat are usually counted toward the overall square footage. However, if there are closets that don’t meet the requirements, like in an unheated, unfinished basement, they probably would not be counted.