Trapezoid Calculator
Calculate area, perimeter and median of a trapezoid from its parallel sides and height.
About Trapezoid Calculator
A trapezoid (trapezium in British English) has one pair of parallel sides. Its area is the average of the parallel sides times the height. The median is the segment connecting the midpoints of the legs.
Formula
Area
A = ½(a + b) × h
- a
- Top parallel side
- b
- Bottom parallel side
- h
- Height between parallel sides
Worked example
With the default values below, Trapezoid Calculator returns Area of 40.0000. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Parallel Side a (top)minimum 0 units
- 6 units
- Parallel Side b (bottom)minimum 0 units
- 10 units
- Heightminimum 0 units
- 5 units
- Leg 1minimum 0 units
- 5.39 units
- Leg 2minimum 0 units
- 5.39 units
Results
- Area
- 40.0000 sq units
- Perimeter
- 26.7800 units
- Median
- 8.0000 units
Step by step
- 1Area= 40.0000
- 2Perimeter= 26.7800
- 3Median (midsegment)= 8
Assumptions and limits
- The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
What is a right trapezoid?
A right trapezoid has two adjacent right angles — one leg is perpendicular to both parallel sides.
What is the median of a trapezoid?
The median (midsegment) connects the midpoints of the non-parallel sides and equals the average of the parallel sides.