Enter dimensions
Results
Enter your dimensions above and the results appear here.
About the Trapezoid Calculator
The trapezoid calculator is a free online tool: area, median and perimeter. Enter top base (a), bottom base (b), height (h), left leg (c) and right leg (d) and the results update instantly, alongside a labelled diagram so you always know which measurement goes where.
Choose your input unit (mm, cm, m, km, in, ft or yd) and optionally show the results in a different one: lengths, areas and volumes are converted correctly. Every answer shows the formula behind it, and the calculation runs in your browser, so nothing is uploaded.
Trapezoid Calculator example
Top base (a) = 6 cm
Bottom base (b) = 10 cm
Height (h) = 4 cm
Left leg (c) = 5 cm
Right leg (d) = 5 cmArea = 32 cm²
Median (mid-segment) = 8 cm
Perimeter = 26 cmHow to use the Trapezoid Calculator
- Pick the unit your measurements use. All dimensions must share the same unit.
- Enter top base (a), bottom base (b), height (h), left leg (c) and right leg (d). Focus a field to highlight the matching label on the diagram.
- Read the results as you type. The largest card is the main answer; the others are the related measurements.
- Copy a single value, copy everything, or share a link that keeps your inputs.
Trapezoid Calculator FAQ
What formulas does the trapezoid calculator use?
A = ½(a + b)h; m = ½(a + b); P = a + b + c + d.
Can I use different units?
Yes. Pick the input unit and, if you like, a different output unit. Area results are shown in squared units and volumes in cubed units.
Is this trapezoid calculator free and private?
Yes. It is free with no sign-up, and calculations happen on your device, so your numbers are never sent to a server.
More 2d shapes
Triangle CalculatorEquilateral Triangle CalculatorRegular Polygon CalculatorCircle CalculatorSector & Arc Calculator