Trapezoid Area Calculator
Area & Perimeter ⚡
Calculate the area and perimeter of any trapezoid (trapezium) instantly.
Quick Examples
Trapezoid Formulas
Area: A = ½ × (a + b) × h
Perimeter (when legs known): P = a + b + c + d
Where a and b are the parallel sides and h is the perpendicular height.
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Frequently Asked Questions
What is a trapezoid?
A trapezoid (called a trapezium in the UK) is a four-sided shape with exactly one pair of parallel sides. The parallel sides are called the bases, and the non-parallel sides are the legs.
What is the perpendicular height?
The perpendicular height is the straight-line distance between the two parallel sides, measured at 90°. It is not the length of a slanted leg.
Is a rectangle a trapezoid?
Technically yes — a rectangle has two pairs of parallel sides, so it satisfies the definition of having at least one pair. A rectangle is a special case of a trapezoid.