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**The floor area ratio is calculated by taking the square footage of a building and dividing it by the square footage of the property that the building sits on.** The floor area ratio is useful to local governments in showing the density of a property or area for zoning decisions.

The square footage of the building includes all floors of the structure when calculating the floor area ratio. For example, a two-story building of 3,000 square feet on a 4,000-square-foot lot has a ratio of 0.75. The same lot with a single-story building of 3,000 square feet would have the same ratio of 0.75.

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## How do I calculate elevation grade?

A:The grade percentage is calculated by dividing the rise over run and by multiplying the result by 100 percent. In other words, the change in vertical distance divided by the change in horizontal distance times 100 percent gives the grade percentage.

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## How do you calculate cubic area?

A:The surface area of a cube is the total sum of the area of the six sides that cover it, and it is calculated by using the formula A = 6a^2. Measure the area of one side of the cube. Multiply that number by 6 to arrive at the total surface area of the cube.

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## How do you calculate the area of a rectangle?

A:To calculate the area of a rectangle, multiply the length of the rectangle by its width. You need to know the length and width of the rectangle. A ruler, a pen, a paper and a divider are helpful in completing this task.

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## How do you calculate the square footage of a circle?

A:

Full Answer >**The area of a circle is determined by the formula: A = π r**You can easily calculate the area of a circle in under a minute. All you need is a calculator, a circle to measure and a tool with which to measure, such as a ruler.^{2}.Filed Under: