Let’s Calculate area of square feet
Remember, the input can only be in feet (ft), inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m) but never a combination of two different units!
Area = Side length x Side length
Length (drop down ft, in, yd, cm, mm, m)
Length (drop down ft, in, yd, cm, mm, m)
Price per unit (drop down ft^{2}, in^{2}, yd^{2}, cm^{2}, mm^{2}, m^{2})
Understanding the Square footage:
What is Square Footage?
Square footage is a measurement of an area expressed in square feet (unit of measurement). An area is is the size of two dimensional surface. The area of a square is the space contained within a set of lines. These lines should be measured in feet (ft) for square footage calculations and if needed, converted to inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m).
How to calculate square footage?
Square footage is the measurement of an area. Area portrays the measurement of a twodimensional space bordered by a set of lines. Square footage is most commonly calculated for the floorings of houses.
To calculate square footage, it is important to recognize the shape of the plane for example, if it’s a square, rectangle, or any other shape. The formula for square footage area used will be in accordance with the shape.
For example, to calculate square footage of a room in square (^{2}) or rectangle shape. Simply multiply the length and width of the area.
To calculate square footage of an oddly shaped area, for example an L shaped area. Start by splitting the area into two separate sections making square or rectangle of both sections. Now, measure the area of both sections and add them together to get the total square footage.
Following are a few examples of how square footage calculators calculate the area for different shapes:

1. Square
Area (ft2) = Side Length x Side Length 
2. Rectangle
Area (ft2) = Length x Width 
3. Triangle
Area (ft2) = ½ × Base × Height
OR
Area (ft2) = ¼ x √ [ (a+b+c) x (b+ca) x (c+ab) x (a+bc) ]
Where a, b and c are sides of a triangle. 
4. Circle
Area (ft2) = π x (diameter/2)2
Where π = 3.14159265
Before calculating square footage make sure the measurements you have taken are in square feet (ft^{2}). If your measurements are in another unit let’s say inches or meters, you will need to convert those measurements in feet by utilizing the method below.
Also checkout our conversion table below for more unit conversions.
If you have measured the length or width other than feet. Do the following to convert them into feet.
 – For inches (in to feet): divide the value by 12. Output will be in feet.
 – For yards (yds to feet): multiply the value by 3. Output will be in feet.
 – For meters (m to feet): multiply the value by 3.281. Output will be in feet.
 – For centimeters (cm to feet): multiply the value by 0.03281. Output will be in feet.
 – For millimeters (mm to feet): multiply the value by 0.00328084. Output will be in feet.
Square footage formula:
Length x Width = Area
How many square feet is a 10×10 room?
10×10 dimensions are common for kitchens or small bedrooms.
10×10 suggests that the shape of the plane is a square as both the measurements are the same.
To calculate the square footage area of the square, use the formula =
Side length × Side Length
= 10 × 10 (assuming all measurements are in feet)
=100 ft^{2}
How many square feet is a 7×7 room?
7×7 dimensions are common for bathrooms, kitchens and book corners in houses.
7×7 suggests that the shape of the plane is a square as both the measurements are the same.
To calculate the square footage area of the square, use the formula =
Side length × Side Length
= 7 × 7 (assuming all measurements are in feet)
=49 ft^{2}
How many square feet is a 20×20 room?
20×20 dimensions are common for garages big enough to accommodate 2 cars, living room space, or big bedrooms usually with walk in closets.
20×20 suggests that the shape of the plane is a square as both the measurements are the same.
To calculate the square footage area of the square, use the formula =
Side length × Side Length
= 20 × 20 (assuming all measurements are in feet)
=400 ft2
About This Calculator:
Our Square Footage Calculator / SQFT calculator helps you calculate the area required for roofing shingles, landscaping for a garden, tiling, flooring space, carpeting and wallpaper. There is even a Siding Square Footage Calculator so you can estimate House Siding costs without any hassle.
We have covered most common use cases. Our calculator allows you to input length and width in many units, such as yards (yds), meters (m), millimeters (mm), centimeters (cm) and inches (in).
It automatically converts your input into feet and also provides output multiple units:
 – Square Footage (ft^{2})
 – Square Yards (yd^{2})
 – Square Meters (m^{2})
 – Acres (acre)
We also have price or cost input which completely optional but allows you to calculate the cost of materials such as plywood, aluminium, paint and labor cost (Most contractors use price per square foot when calculating their labor cost).
How you can use square footage calculator in your daily life?
Since square footage (sq ft^{2}) is a common unit of measurement. The usage of square footage calculator is also common in our daily life. Specially If you are a hobbyist who likes to work on DIY projects or a professional construction worker or a carpenter. Your projects may include roofing shingles, landscaping for a garden, tiling, flooring space, carpeting and wallpaper. Here we will explain a few real life examples of how square footage calculator can be useful in your next project?
1. How to figure out number of sheets required to sheating wall or roof:
Fоr example, іf you hаvе a wall which is 8 feet high and 40 feet long. The ѕԛuаrе fооtаgе fоr thе wаll can be simply calculated with our square footage calculator. Which is going to be 320 Square feet (sq. ft. or ft^{2}).
Mоѕt ѕhееt gооdѕ are 32 ѕԛuаrе feet. Thе ѕԛuаrе footage оf the wаll is divided by 32.
It wіll take 10 sheets оf рlуwооd or іnѕulаtеd sheathing tо cover thіѕ wаll.
2. How to figure out cost of flooring:
Flооrіng is аlѕо аmоng one of thоѕе things that use thе square foot method tо figure lаbоr аnd materials. This іnсludеѕ сеrаmіс аnd ԛuаrrу tiles, hardwood, laminate, аnd vinyl flooring, аnd саrреtіng. Most соntrасtоrѕ аnd іnѕtаllеrѕ use a price реr square fооt fоr their labor whеn саlсulаtіng thеіr соѕtѕ for іnѕtаllаtіоn.
Abbreviations of unit area:
Ft^{2} = Square feet
In^{2} = Square Inches
Yd^{2} = Square Yards
Cm^{2} = Square Centimeters
Mm^{2} = Square Millimeters
M^{2} = Square Meters
Conversion factors:
To convert among square feet, square inches, square yards, square centimetres, square millimetres and square meters you can utilize the following conversion table.
Square feet to yards  multiply ft^{2} by 0.11111 to get yd^{2} 
Square feet to 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 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} 
Square meters to square millimetres  multiply the m^{2} value by 1000000 to get mm^{2} 
Square meters to square centimetres  multiply the m^{2} value by 10 000 to get cm^{2} 
Square centimetres to square metres  multiply the cm^{2} value by 0.0001 to get mm^{2} 
Square centimetres to square millimetres  multiply the cm^{2} value by 100 to get mm^{2} 
Square millimetres to square centimetres  multiply the mm^{2} value by 0.000001 to get cm^{2} 
Square millimetres to square metres  multiply the mm^{2} value by 1000000 to get m^{2} 