Trapezoid Calculator
Calculate area and perimeter from parallel sides, height, and legs.
Formula
A = (a+b)/2 × h, P = a+b+leg1+leg2
Area equals half the sum of parallel sides times height. Perimeter is the sum of all sides.
Examples
a=8, b=5, h=4
a=12, b=6, h=5
Frequently Asked Questions
What is the area formula for a trapezoid?
A = (a + b) / 2 × h, where a and b are the parallel sides and h is the height.
How do I calculate the perimeter of a trapezoid?
Add all four sides: P = a + b + leg1 + leg2.
About this Calculator
Calculate area and perimeter from parallel sides, height, and legs. All calculations are performed in your browser for instant results. Formulas are mathematically exact using JavaScript's built-in Math functions.