Find the area of a shape calculator

Rectangle Shape

Calculator Use

Use this calculator if you know 2 values for the rectangle, including 1 side length, along with area, perimeter or diagonals and you can calculate the other 3 rectangle variables. A square calculator is a special case of the rectangle where the lengths of a and b are equal.

Units: Note that units of length are shown for convenience. They do not affect the calculations. The units are in place to give an indication of the order of the calculated results such as ft, ft2 or ft3. Any other base unit can be substituted.

Rectangle Formulas

Area of a rectangle:

A = ab

Perimeter of a rectangle:

P = 2a + 2b

Polygon diagonals of a rectangle:

p = q = √(a2 + b2)

Rectangle Calculations

• Calculate A, P, p | Given a, b
  Given sides lengths a and b calculate area, perimeter and diagonals
  • A = ab
  • P = 2a + 2b
  • p = q = √(a2 + b2)
• Calculate P, p, b | Given A, a
  Given area and side length a calculate perimeter, diagonals and side b
  • b = A / a
  • P = 2a + 2b
  • p = q = √(a2 + b2)
• Calculate P, p, a | Given A, b
  Given area and side length b calculate perimeter, diagonals and side a
  • a = A / b
  • P = 2a + 2b
  • p = q = √(a2 + b2)
• Calculate A, p, b | Given P, a
  Given perimeter and side length a calculate area, diagonals and side b
  • b = (P - 2a) / 2
  • A = ab
  • p = q = √(a2 + b2)
• Calculate A, p, a | Given P, b
  Given perimeter and side length b calculate area, diagonals and side a
  • a = (P - 2b) / 2
  • A = ab
  • p = q = √(a2 + b2)
• Calculate A, P, b | Given p, a
  Given diagonals and side length a calculate area, perimeter and side b
  • b = √(p2 - a2)
  • A = ab
  • P = 2a + 2b
• Calculate A, P, a | Given p, b
  Given diagonals and side length b calculate area, perimeter and side a
  • a = √(p2 - b2)
  • A = ab
  • P = 2a + 2b

How to find the area of irregular shapes?

Remember, the input can only be in feet (ft), inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m) but never a combination of two different units!. . If you have inputs in different units of measurement. Please refer to our conversion table below.

Formula

Area = b × h

Understanding the area of irregular shape:

What is the difference between regular and irregular shape?

Regular Shape: The sides and angles of regular shapes are all equal.

Irregular Shape: The sides and angles of an irregular shape can be of any length and size.

Regular Shape

Irregular Shape

How to calculate area of an irregular shape?

Now that we know the difference between regular and irregular shapes. Let’s make our calculation process simple by dividing the irregular shape into regular shapes. Check example below, here we have divided the shapes into triangles which is a regular shape.

How to use irregular area calculator?

Step 1: Measure all sides of the area in one unit (Feet, Meter, Inches or any other).

Step 2: Enter length of horizontal sides into Length 1 and Length 2. And Width of the vertical sides into Width 1 and Width 2. (See image above).

Step 3: Press calculate button. The output our calculator provides is independent of the unit of measurement. For example, If you have entered values in feet. The output will always be in feet.

Our Formula: Area = b × h

Abbreviations of unit area:

Ft2 = Square feet

In2 = Square Inches

Yd2 = Square Yards

Cm2 = Square Centimeters

Mm2 = Square Millimeters

M2 = Square Meters

How to find the area of a parallelogram?

Step 1: Determine all the sides of irregular shape, Make sure all the sides are in same unit.

Step 2: Draw the area on a piece of paper using the measurements you obtained. Remember your drawing is to scale.

Step 3: Divide the drawing into different shapes. The easy ones are Square and rectangle, circles and triangle could be a bit tricky.

Step 4: Calculate the area of each shape using our Square footage calculator. For rectangles and squares, multiply width by height. For triangles, multiply the base by the height and then divide by 2. For circles, multiply the radius square by 3.14 (pi). The radius of a circle is the distance from its center point to any other point on the edge of the circle.

Step 5: Add the areas of all the individual shapes to find the total square footage.

Our Formula: Area = b × h

Conversion factors:

To convert among square feet, square inches, square yards, square centimetres, square millimetres and square meters you can utilize the following conversion table.

How do you calculate the area of a shape?

How do I calculate the area of an irregular shape?

How do you find the area with different sides?