# Area Calculator

## Using the Area Calculator

This calculator is perfect for finding the area, given a length and width number. This is helpful for beginners learning math or anyone that wants to learn how to find the area of a shape. Area is defined as the space inside the perimeter/boundary of a space and can be symbolized as (A). We notate area in square units, eg. square feet, but that can also be expressed as ft^{2}

## How to Find Area

Area is found by multiplying the length times the width of a rectangle.

- Find the length and width of a rectangle. Different shapes may require more complicated formulas. We have outlined how to find the area of several different shapes below.
- Convert the length and width to the same unit. For example, if you’re trying to find square feet of a space then convert the length and the width to feet. You can use our length unit conversion utility to convert length measurements.
- Multiply the length times the width

### Square

(A) = length x width

### Rectangle

(A) = length x width

### Rectangular Border

outside (A) = length x width

inside (A) = (length – (2 x border)) x (width – (2 x border))

border (A) = outside (A) – inside (A)

### Circle

(A) = pi x (diameter / 2)^{2}

pi = 3.14159265359

### Triangle

(A) = (1/4) x

√(a+b+c) x (b+c-a) x (c+a-b) x (a+b-c)

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