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`A = 1/2 * "h" *( "a" + "b" )`

Enter a value for all fields

The **Area of a Trapezoid** calculator computes the area of a trapezoid based on the measure of the the top (**a**) and bottom (**b**) sides and the height (**h**).

**INSTRUCTIONS:** Choose units and enter the following:

- (
**a**) Top Length - (
**b**) Bottom Length - (
**h**) Vertical Distance between top and bottom

**Trapezoid Area (A):** The calculator returns the area (**A**) in square meters. However, this can be automatically converted to other area units via the pull-down menu.

A trapezoid is a special case of a quadrilateral, four sided polygon, where two non-adjacent sides are parallel (see diagram).

The formula for the area of a trapezoid is:

where:

- A is the area of the trapezoid
- h is the height
- a is the length of one parallel side
- b is the length of the other parallel side

**Trapezoid **or **trapezium**, as it's known in the UK, is a quadrilateral with two parallel sides, shown as the top and bottom in this diagram. The height of a trapezoid (h) is the perpendicular distance between the two parallel sides.

A trapezoid volume is made of four trapezoids one the sides.