Area of a trapezoid calculator
Enter the dimensions of a trapezoid and read off its area, its perimeter and the quantities that follow from them.
Area
32m²
- Perimeter
- 26
- Median (midline) length
- 8
Show the working
- First parallel side = 10
- Second parallel side = 6
- Height = 4
- First leg = 5
- Second leg = 5
- Area = (10 + 6) / 2 * 4 = 32
- Perimeter = 10 + 6 + 5 + 5 = 26
- Median (midline) length = (10 + 6)/2 = 8
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- area = (a + b) h / 2
- the median equals the average of the parallel sides
Called a trapezium in British usage, where "trapezoid" means something else entirely.
Lengths are entered in metres by default; switch any field to feet, inches or millimetres and the conversion is exact.