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Trapezoid Calculator
Enter both bases and the height — area updates instantly.
Formula
Area = (a+b)·h/2
Example
Bases 60 and 40 mm, height 30 mm → Area = (60+40)·30/2 = 1500 mm².
FAQ
What is a trapezoid?
A quadrilateral with one pair of parallel sides (the bases a and b). The height h is the perpendicular distance between them.
How do I convert a trapezoid to a rectangle?
The midline (a+b)/2 times the height gives an equal-area rectangle — that is exactly what the formula computes.