# Area and Perimeter

# Rectangle

Calculate the area and perimeter of a rectangle. This calculator uses feet and or inches for measurements.

Rectangle = a four-sided shape with the opposite sides running parallel to each other and four 90° corners.

### Rectangle Area and Perimeter

#### Calculation

- length in feet and or inches
- width in feet and or inches
- decimal precision, the number of digits after the decimal point

#### Results

- the length of the diagonal in decimal feet
- the area of the rectangle in decimal square feet
- area in square feet and inches
- the area in decimal square inches
- the area in square inches
- the area in square metres
- the perimeter of the rectangle in decimal feet
- the perimeter in lineal feet and inches
- the perimeter in decimal inches
- the perimeter in inches
- the perimeter in metres

##### Formula

A = ab
P = 2(a+b)
where A is the area of the rectangle
a is the length
b the width
P the perimeter of the rectangle

##### Conversions

one square foot ( ft²) = 144 square inches (in²)
one square inch (in²) = 0.00694444444444443 square feet (ft²)
one square foot ( ft²) = 0.09290304 square metres (m²)
square inch (in²) = 0.00064516 square metres (m²)

### Area and Perimeter of Various Shapes

### Changing the shape of an Area

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