Area Calculator

Calculate an Area

Result:



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 ft2

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

Calculate the area of a square

Square

(A) = length x width


Calculate the area of a rectangle area

Rectangle

(A) = length x width


Calculate the area of a border

Rectangular Border

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

border (A) = outside (A) – inside (A)


Calculate the area of a circle area using the formula πr²

Circle

(A) = pi x (diameter / 2)2

pi = 3.14159265359


Calculate the area of a triangle area

Triangle

(A) = (1/4) x
(a+b+c) x (b+c-a) x (c+a-b) x (a+b-c)


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