Q:
# How do you use a square-footage calculator?

**To calculate square footage using an online calculator, enter the length and width of the rectangle.** Calculatorsoup.com and Calculator.net contain square footage calculators, with the latter one also including square footage calculators for triangles and circles.

Credit:
Spaces Images
Blend Images
Getty Images

To measure square footage for a triangle, Calculator.net requires the length of each side of the triangle. For a circle, you need to enter its radius into the calculator. A square foot is the unit of measurement for area and measures one foot long and one foot wide. The measurement is often used for building and home improvement purposes. Home sizes are expressed in square footage, as are room and lot sizes. It's essential to know the square footage of the room when buying flooring or wallpaper.

Building lot sizes are often expressed in acres. A homeowner who wants to know how large of house he can build on an acre can convert the building lot acreage into square feet using the formula of one acre equals 43,560 square feet. Retailers sometimes sell carpet in square yards rather than square feet. To determine how many square yards of carpet you need, divide the room's square feet by nine. For example, a room that measures 15 feet by 10 feet has 150 square feet or 16.67 square yards.

Learn more about Measurements-
Q:
## How do you convert linear feet to square feet?

A: If the width of the material in inches and the linear length in feet are both known, convert the width to a fraction of a foot, then multiply width times l... Full Answer >Filed Under: -
Q:
## How can you measure a square foot?

A: To measure the square footage of a rectangular or square space, measure the length and width in feet and then multiple the two numbers together. Thus, to m... Full Answer >Filed Under: -
Q:
## How many rolls of insulation do I need?

A: Determine the square footage to be covered with insulation by measuring the height and width of the surface and multiplying those numbers. An 8-foot by 10-... Full Answer >Filed Under: -
Q:
## Can you find the width of a rectangle if you only know the perimeter?

A: If the perimeter of a rectangle is known, finding the width is only possible if the length is also known. Infinite combinations of lengths and widths of a ... Full Answer >Filed Under: