Trapezoid Area Calculator
Compute the area of a trapezoid by entering both parallel sides and the height. Applies the standard ½(a + b) × h formula for quick results.
Area
Enter values to calculate
How to Use the Trapezoid Area Calculator
1
Enter the length of parallel side A.
2
Enter the length of parallel side B and the height.
3
View the computed area.
Frequently Asked Questions
What is the trapezoid area formula?
Area = ½ × (a + b) × h, where a and b are the parallel sides and h is the perpendicular height between them.
Does this work for irregular trapezoids?
Yes — as long as you know the two parallel sides and the perpendicular distance between them.
What if I only know the four sides?
You need the height. For an isosceles trapezoid you can derive the height using the Pythagorean theorem.