Quadrilateral Area Calculator
Trapezoid: (a+b)h/2. Parallelogram: ah. Perpendicular diagonals: ab/2.
Inputs and units
- Shape: Choose Trapezoid, Parallelogram, Rhombus / kite (perpendicular diagonals).
- First base / diagonal: Enter your value in the format and unit shown.
- Second base / diagonal: Enter your value in the format and unit shown.
- Perpendicular height (unused for diagonals): Enter your value in the format and unit shown.
Calculation method
Trapezoid: (a+b)h/2. Parallelogram: ah. Perpendicular diagonals: ab/2.
Worked example
The example values are: Shape = trapezoid; First base / diagonal = 8; Second base / diagonal = 6; Perpendicular height (unused for diagonals) = 4
- Area (square units): 28
Assumptions and limitations
This does not solve an arbitrary quadrilateral from four side lengths.
Using your result
Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.
Quadrilateral Area Calculator FAQs
What method does this calculator use?
Trapezoid: (a+b)h/2. Parallelogram: ah. Perpendicular diagonals: ab/2.
What should I check before using the result?
This does not solve an arbitrary quadrilateral from four side lengths.