If you need to find the area of a quadrilateral, this calculator will make it easy. Simply enter any two sides and we’ll tell you how to calculate the other two. Then just plug those numbers into our formula below – voila! With this simple tool, you’ll never need to memorize formulas again.

Take a look other related calculators, such as:

What is a quadrilateral?

Quadrilaterals are polygonal shapes with four sides. The opposite sides of the quadrilateral are parallel and always equal in length.

A quadrilateral has to have at least 4 straight lines (not curved) that connect each pair of opposite vertexes, forming 4 interior angles evenly spaced around its perimeter; but there are many types of quadrilaterals based on the number of sides because there are so many ways to make 4 interiors that fit together evenly!

Quadrilateral shapes

A quadrilateral is a four-sided shape. Each side of the shape is not the same length, and each angle between the two sides does not equal 90 degrees.

There are many different types of quadrilaterals, including rectangles (which have all angles equal), rhombuses (which have all sides equal), squares (which have all angles equal to 90 degrees), and parallelograms (which have at least one pair of parallel sides).

Examples include:

  • A square has four right angles and four congruent sides. Its opposite sides measure the same length, as do its diagonals. The opposite angles add up to 180 degrees.
  • A rectangle also has four right angles—but its opposite sides are unequal in length since they’re both longer than half their diagonal but shorter than three times they’re diagonal. It’s called a “rectangle” because it forms an “R” when rotated 180 degrees about one corner point; this rotation does not change any measurements made by those diagonals on either side which meet in that corner point itself where there would normally be no measurement taken because we only count straight lines within them being measured instead!

Quadrilateral area formulas

Let’s take a look at the formulas for calculating the area of different quadrilaterals.


A = b \times h


A = \frac {a + b}{2} \times h


A = a \times b


A = a^2


A = \frac {p \times q}{2}

How to find the quadrilateral area?

This calculator will find the area of a quadrilateral. You can also use it to find the base and height of a quadrilateral and vice versa. If you know one side length, two diagonals, or one diagonal and one angle, you can use this calculator to find the other lengths as well.


What is a quadrilateral shape?

A quadrilateral is a 4 sided closed figure.

What are the examples of quadrilaterals?

A few examples of quadrilaterals are square, rectangle, and trapezium.

What is not a quadrilateral?

Any polygon that doesn’t have 4 sides and 4 angles isn’t a quadrilateral.