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That depends on why you need the square footage. For building permits, tax assessments, etc. it is the outside; for floor covering of course the inside...

Q: When calculating square footage for new structure do you calculate from inside wall to inside wall or from the outside perimeter to outside?

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One thing that can be calculated using a Square Footage Calculator is the Length and Width of a Rectangle, Circle, Square or Triangle. This comes in handy for calculating room sizes.

Multiply by 144.

the way they use math is buy calculating square yardage for carpeting; square footage for painting and wallpaper. Dimensions of rooms to fit the furniture; Lay out floor plans and traffic patterns; calculate size for window coverings .

In order to calculate the square footage you need to find the length and the width of the room in feet. You multiply the length and the width to give you the square footage of the room

Multiply the length by the width to get square footage.

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The formula for calculating square footage is a=S2 (a = area and s = side) Example, to calculate the square footage of a room that is 15 feet wide and 12 long, you would multiply 15 x 12, which will give you the square footage.

There's no way to calculate that just from square footage.

One thing that can be calculated using a Square Footage Calculator is the Length and Width of a Rectangle, Circle, Square or Triangle. This comes in handy for calculating room sizes.

15x12ft

Take your square footage and divide by 9.

You should be able to. Just take the length x the width = square footage. It's not an accurate reflection of what your actual living area is but, that it how it is calculated for appraisal and loan purposes in the U.S. ========== This is incorrect. If your perimeter is 120 it could be made up of many combinations of sides. Say for example 30x30 so the sq ft of that is 900. It could be also 20x40 which has an sq ft. of 800.

To calculate square footage of a pipe you need to use the area formula of a circle, a=1/2bh. then find the circumference of the entire pipe.

Multiply by 144.

the way they use math is buy calculating square yardage for carpeting; square footage for painting and wallpaper. Dimensions of rooms to fit the furniture; Lay out floor plans and traffic patterns; calculate size for window coverings .

In order to calculate the square footage you need to find the length and the width of the room in feet. You multiply the length and the width to give you the square footage of the room

Multiply the length by the width to get square footage.

To calculate square footage, you multiply the length by the width of the room. So, if the room measures 10 ft. by 18 ft., your total area is 180 sq. ft.