Trapezoid Area Calculator

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Trapezoid area calculator! An online tool to calculate the area of trapezoid. Moreover, it can be used to calculate:

  • Base a
  • Base b
  • Height
  • Side c
  • Side d
  • Perimeter

You can either choose base or sides of trapezoid as a parameter to find its area.

In this space, we will explain how to use area of a trapezoid calculator, trapezoid definition, trapezoid area formula, and how to calculate area of trapezoid without using calculator.

What is a trapezoid?

A trapezoid is a four-sided flat shape with one pair of opposite parallel sides. It appears as if the top of the triangle was cut parallel to the base.

Typically, the longest side of a trapezoid lies downwards and there are two sloping sides for the edges. Usually, the top part is shorter than the lower part. 

The internal angles of a trapezoid are collectively 360°. The angles on the same side of the leg are also known as adjacent and always amount to 180 °.

α + β = 180°

γ + δ = 180°

Area of trapezoid formula

Formula for area of a trapezoid is derived from area of triangle formula. It can be stated as:

A = (a + b) × h / 2


  • A represents the area of trapezoid,
  • a represents the upper parallel side or upper base of trapezoid,
  • b represents the base of trapezoid, and
  • h refers to the height of trapezoid.

Note: If a trapezoid with equal length of sides having a = b, it would be a rectangle. You can calculate the rectangle area using our area of rectangle calculator.

Perimeter of trapezoid formula

Perimeter of trapezoid can be calculated using the following equation:

P = a + b + c + d

Perimeter of a trapezoid can also be calculated using the above calculator.

How to use trapezoid area calculator?

Before calculating the area or perimeter of trapezoid, you must know how to use this calculator for that purpose. 

To use this calculator, follow the below steps:

  • Select the option for which you want to solve a trapezoid, i.e., area, perimeter, etc.
  • Choose the parameters. For example, if you select area in the first step, you can choose from two set of parameters:
    • Base a, base b, height
    • Side c, side d, height, perimeter
  • Enter the values in the respective input boxes.
  • You can use any unit of measurement. i.e., cm, inches, feet, meters, yard, etc.
  • Hit the Calculate button to get the required value of trapezoid.

How to find the area of a trapezoid?

The question, “what is the area of a trapezoid” has been asked so many times. We will answer this question and explain it in detail in this section. You can always use our trapezoid calculator above, however, you should be able to calculate the area of trapezoid by yourself.

To calculate the trapezoid area, follow the below steps:

  • Measure and write down the base a, base b, and height h of the trapezoid.
  • Write down the formula of trapezoid area.
  • Substitute the values in the formula and calculate the area.


Find the area of a trapezoid that have height of 8 cm, upper length of 4 cm, and bottom length of 6 cm?

Step 1: Measure and write down the base a, base b, and height h of the trapezoid.

a = 4 cm, b = 6 cm, h = 8 cm

Step 2: Write down the formula of trapezoid area.

A = (a + b) × h / 2

Step 3: Substitute the values in the formula and calculate the area.

A = (4 cm + 6 cm) × 8 / 2

A = 10 cm × 4

A = 40 cm

So, a trapezoid with 8 cm height, 4 cm top side, and 6 bottom side would have area of 40 cm.


Is the area of a trapezoid squared?

No, the area of a trapezoid is not squared. In trapezoid area equation, we add both upper and lower sides of trapezoid. That is why, the area of trapezoid doesn’t get squared.

A = (a + b) × h / 2

It comes in a single measurement unit such as centimeter, inches, etc.

What is a trapezoid look like?

A trapezoid has four sides. Two of the sides are parallel to each other. A trapezoid looks like a triangle with flat upper corner. See the trapezoid image below:

Is a rectangle a trapezoid?

According to the inclusive definition of a trapezoid, rectangle is a trapezoid along with rhombuses and squares. So, inclusively, we can say that rectangle is a trapezoid.

Is every trapezoid a rhombus?

No. Every trapezoid is not a rhombus. Rhombus has two pairs of parallel sides while trapezoid has one pair of parallel side. If a trapezoid has both of pair of parallel sides, then it will be rhombus.

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Melvina Evans | 06/08/2019

So many math professionals like me loved your Trapezoid Area Calculator. A Fantastic tool.