Calculate the area of a trapezoid (trapezium) given its bases and height.
Trapezoid Dimensions
Calculation Results
180.00
Total Area (A)
The space occupied by the quadrilateral with at least one pair of parallel sides.
Average Base15.00
About this calculator
Understanding Trapezoids
A trapezoid (known as a trapezium in many countries) is a 4-sided flat shape with one pair of opposite sides parallel. To find its area, you take the average of the two parallel bases and multiply by the vertical height between them.
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Pro Tips
The 'height' must be the vertical (perpendicular) distance between the parallel lines.
If the non-parallel sides have equal length, it's called an 'Isosceles Trapezoid'.
If one of the non-parallel sides is perpendicular to the bases, it's a 'Right Trapezoid'.
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Fun Facts
"The term 'trapezoid' comes from the Greek 'trapeza', meaning 'table'."
"In North America, a quadrilateral with NO parallel sides is a 'trapezium', but in the UK, that's exactly what a 'trapezoid' is! The definitions are swapped."
"Most highway sound barriers and bridge supports are designed in trapezoidal shapes for structural stability."
