Trapezoid Area Calculator

Use this free online calculator to find the area of a trapezoid given its two parallel sides (bases) and height.

\[ A = \frac{1}{2}h(a+b) \]

Trapezoid diagram showing bases a and b and height h

How to Use

  1. Enter the lengths of bases \(a\) and \(b\).
  2. Enter the height \(h\).
  3. Click Calculate.





Formula Explanation

The area of a trapezoid equals half the height multiplied by the sum of the two parallel sides:

\[ A = \frac{1}{2}h(a+b) \]

This formula works because a trapezoid can be transformed into a rectangle with the same area.

More tools: Online Geometry Calculators