Trapezoid Calculator
Compute the area, perimeter and median of a trapezoid. Enter the two parallel sides and the height for area and median, or enter all four sides for the perimeter. Both inputs are optional — the calculator reports whatever is determined.
Enter dimensions
Enter the parallel sides and height (and legs for perimeter).
Trapezoid formulas
Area: A = ½ · (a + b) · h
Median: m = (a + b) / 2
Perimeter: P = a + b + c + d
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Frequently asked questions
A trapezoid has exactly one pair of parallel sides — usually called the bases. In this calculator they are labelled a and b. The non-parallel sides are the legs (c and d).