Area of a Trapezoid Calculator
A = ½ × (parallel side a + parallel side b) × height.
Result
Area
32.0000 units²
Average parallel side × height: 8.0000 × 4.
- a (top)6
- b (bottom)10
- Height4
- Mean of parallels8.0000
Step-by-step
- Area = ½ × (6 + 10) × 4 = ½ × 16.00 × 4 = 32.0000.
How to use this calculator
- Enter the two parallel sides and the perpendicular height between them.
- Read the area.
About this calculator
A trapezoid (US) or trapezium (UK) has exactly one pair of parallel sides. Its area is the average of the parallel sides times the perpendicular distance between them. Equivalent to a rectangle whose width equals the average of the two parallels.
Frequently asked
Cut the trapezoid horizontally at the midpoint and rotate the top piece — you get a rectangle whose width is the average. Same area.
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