How to Figure Out Square Feet

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 (ft2)
  • – Square Yards (yd2)
  • – Square Meters (m2)
  • – 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).

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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 two-story house, I just multiply that by two,’” Day says. However, if that first floor includes a two-story foyer, you can’t count the non-usable 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 find the square footage of a circle

  1. Measure the diameter of your circle in feet.
  2. Divide your diameter by 2 and then square it (multiply it by itself).
  3. Multiply your total by π (3.14159265)
 The formula for calculating the area of a circle

The formula for calculating the area of a circle is: π r2 (with r being the radius of the circle, which is half the diameter). π is the symbol for pi (3.14159265).

 

Triangle

    Measure the base of the triangle. For example, say the base of a triangle measures 3 feet.

    Measure the height of the triangle, which is the distance from the base to the top point. In our example, the height of the triangle is 5 feet.

    Multiply the base by the height and divide by two to determine the square footage of the triangle. In our example, 5 feet times 3 feet equals 15 square feet, which divided by two equals 7.5 square feet.

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.

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 ft2 by 144 to get in2
  • Square Feet to Square Yards
    • multiply ft2 by 0.11111 to get yd2
  • Square Feet to Square Meters
    • multiply ft2 by 0.092903 to get m2
  • Square Yards to Square Feet
    • multiply yd2 by 9 to get ft2
  • Square Yards to Square Meters
    • multiply yd2 by 0.836127 to get m2
  • Square Meters to Square Inches
    • multiply m2 by 1,550 to get in2
  • Square Meters to Square Feet
    • multiply m2 by 10.7639 to get ft2
  • Square Meters to Square Yards
    • multiply m2 by 1.19599 to get yd2

Methods for how to calculate square feet for different shapes

Different shapes have different ways of calculating square footage. For all the shapes, it may be helpful to convert the measurement of the shape into square feet before making your calculation. Converting the measurements can help you keep the shape to scale, especially if the sides have different measurements, such as feet and inches or yards and meters. You could also perform the calculation and then convert the final measurement to square feet to achieve the same result.

Use the methods below to help you calculate square feet for seven different shapes:

How to calculate square feet for squares and rectangles

Squares and rectangles use the same formula to calculate square feet. This formula is:

A = length x width

In this equation, "A" is the total area of the shape in square feet. The length is the measurement of one side of the shape in feet and the width is the measurement of another side of the shape in feet. You can use the steps below to calculate the square footage of squares and rectangles with the formula above:

  1. If necessary, convert your measurements for each side of the shape into feet.

  2. Multiply the length and the width of the shape together to get the area of the square or rectangle in square feet.

How to calculate square feet for triangles

The square footage formula for triangles is:

A = 1/2 base x height

In this equation, "A" is the area of the triangle in square feet, "1/2 base" is the length of the bottom side of the triangle in feet and the height is the vertical distance from the bottom side of the triangle to the top corner in feet. You can use the following steps to calculate the area of a triangle:

  1. Convert the measurements for the base and height into feet.

  2. Divide the length of the base by two to get half of the base.

  3. Multiply half the base by the height to find the square footage area of the triangle.

How to calculate square feet for circles

To calculate the area of a circle, it's necessary to use the number pi, which is represented by the symbol π. You can use the decimal 3.14 to represent the value of pi. The formula to calculate the square footage of a circle is:

A = π x radius2

In this equation, "A" is the total square footage, π is equal to 3.14 and the radius is the distance from the exact center of the circle to the outside edge in feet. To calculate the area of a circle, use the following steps:

  1. If it isn't already in feet, convert the measurement for the radius into feet.

  2. Multiply the length of the radius by itself to get feet squared.

  3. Once you've calculated the square feet of the radius, multiply that result by pi to get the total area of the circle in square feet.

How to calculate square feet for trapezoids

To calculate the square footage of a trapezoid, you can use the formula:

A = [(base length + top length) / 2] x height

In this equation, "A" is the total area of the shape in square feet. The base length is the length of the bottom of the trapezoid in feet, and the top length is the length of the top of the trapezoid in feet. The height is the vertical distance from the base length to the top length of the trapezoid in feet. You can use the following steps to calculate the area of a trapezoid:

  1. If necessary, convert the measurements for the base length, top length and height into feet.

  2. Add the base length and the top length together to calculate the area for the nonrectangular sections of the trapezoid created by the diagonal sides.

  3. Divide the sum of the base length and the top length by two to ensure you account for the diagonal sides in the equation.

  4. Multiply that result by the height to find the area of the trapezoid in square feet.

Related: Rules of Multiplication: Definition and Examples

How to calculate square feet for rhombuses

To calculate the square footage of a rhombus, you can use the following formula:

A = distance from one pair of opposite angles x distance from the other pair of opposite angles

In this equation, "A" is the area of the rhombus in square feet and the distances from both pairs of opposite angles are in feet. You can calculate the area of a rhombus using the following steps:

  1. Convert the measurements for the distances of the rhombus into feet if necessary.

  2. Multiply the interior lengths, which are the distances from opposite angles within the rhombus, to find the area in square feet. The interior lengths intersect with each other at the center of the shape.

How to calculate square feet for parallelograms

To calculate the square footage of a parallelogram, you can use the formula below:

A = base x height

In this equation, "A" is the area of the parallelogram in square feet, the base is the length of the bottom side of the parallelogram in feet and the height is the vertical distance from the base of the parallelogram to the top side in feet. You can calculate the square footage of a parallelogram using the steps below:

  1. If necessary, convert the measurements for the base and height into feet.

  2. Multiply the base by the height of the parallelogram to find its area in square feet.

FAQS

How to Calculate Square Footage?

Square footage is the measurement of an area. The area is the measurement of a two-dimension space bordered by a set of lines. Square footage is mostly used in the calculation for the flooring of the house. To calculate square footage area, it is important to recognize the shape of the plane for example, if it’s a square, rectangle, or any other shape, then the formula for square footage area will be according to the shape. For example, to calculate the square footage of a room in a 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 a 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 4. Circle => Area (ft2) = π x (diameter/2)2

How to Calculate Square Footage of a Room?

Whenever you plan to buy new flooring, the first thing is to calculate the Square Footage of the room. It’s quite easy to calculate Square Footage, first, you need to measure the square footage of all areas of the room, this includes nooks and crannies and then you need to add all measurements together. This planning takes time and lots of measurements so make sure to double-check your measurements before ordering your flooring. For the safe side, add 5-10% of the waste factor, it is to prevent errors, damages, and extra cuts. To calculate this you need to add a waste factor in square footage like you have 100sqft and you are assuming 5% as a waste factor then 100 × 0.05 = 5 means total sqft will be 100 + 5 = 105sqft.

How to Calculate Square Footage of a House?

Whenever you plan to measure the square footage of the house, start with these supplies: 1- Notes, Pencil. 2- Calculator 3- Measuring tool Now it is important to recognize the shape of the house, perfect square, rectangle, or any other shape, then the formula for square footage area will be according to the shape. For example, to calculate the square footage of a room in a square (2) or rectangle shape. Simply multiply the length and width of the area. If you are measuring for a two-story house, simply multiple the square footage by 2.

How to Measure for Wallpapering? First, measure the width (feet) of the wall you plan to add wallpaper. Round the measurement up to the nearest foot. For example, if 14 feet, 9 inches wide, it will be around 15 feet. Then, measure the height (feet) of the wall you plan to add wallpaper. Round the measurement up to the nearest foot. Multiply the rounded width and the height of the wall. This will be your total square footage of the wall. Now measure the width and height of large areas that will not be going to be covered with wallpaper, such as double doors, and round these heights and width. Multiply the width and height of all these areas and sum them up together to get the total square footage of any large area. Subtract the square footage of any large areas from the total square footage of the wall. The result is the total square footage of wallpaper needed to cover the wall.

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