Trapezoid Area

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.

The Math / Science

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:

      A = ½•h•(a+b)

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.

Trapezoid Calculators

• Area of a Trapezoid based on top, bottom and separation
• Area of a Trapezoid based on length of 4 sides
• Height of a Trapezoid
• Angles of a Trapezoid