Trapezoid Calculator
Free online trapezoid calculator tool.
About 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).
How Trapezoid Calculator Works
- Step 1: Base A & B: Input the lengths of the two parallel sides (the top and bottom).
- Step 2: Height: Input the straight, perpendicular distance between the two parallel bases.
- Step 3: Calculate: The tool averages the two bases and multiplies by the height to find the precise area.
Frequently Asked Questions
Why do you average the two bases?
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.
What is an isosceles trapezoid?
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.
Can the height be slanted?
No! The height must always be the straight 90-degree drop between the two parallel bases, not the length of the slanted sides.