Trapezoid Calculator

Free online trapezoid calculator tool.

Base A

Base B

Height (h)

What Is a Trapezoid Calculator?

The Trapezoid Area Calculator finds the exact surface area of a trapezoid (or trapezium). A trapezoid is a four-sided flat shape with exactly one pair of parallel sides (called bases). This free online tool is useful for trapezoid calculator, trapezoid area calculator, trapezium area calculator. Common use cases include geometry homework, construction, architecture, engineering, and area from parallel bases and height. It is designed for quick browser-based calculations and is suitable for homework, programming, study, everyday math, and checking results.

How to Use This Trapezoid Calculator

1
Enter Base AType the length of the first parallel side.
2
Enter Base BType the length of the second parallel side.
3
Enter HeightUse the perpendicular distance between the parallel bases.
4
CalculateThe tool applies the trapezoid area formula.
5
Review the AreaThe result uses the same squared unit implied by your inputs.

Frequently Asked Questions

By averaging the top and bottom bases, you mathematically transform the slanted trapezoid into a perfect rectangle, making it easy to multiply by the height.

An isosceles trapezoid is one where the two non-parallel sides are equal in length, making the shape perfectly symmetrical. The area formula remains exactly the same.

No! The height must always be the straight 90-degree drop between the two parallel bases, not the length of the slanted sides.

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