How to use this calculator
The area equals the average of the parallel side lengths multiplied by the perpendicular height.
The method
Area = (a+b)h/2
Enter your values in the labeled fields and choose Calculate. The result panel shows the answer and supporting values when useful.
WORKED EXAMPLE INPUT
Base a: 8, Base b: 14, Height: 6
Select Calculate to evaluate these example values.
Scope and limitations
The entered height must be perpendicular to the parallel bases.
Common questions
Can I use different units?
Use consistent units unless this page is a unit converter. The result follows the units implied by the inputs.
Are results exact?
Displayed values may be rounded. Keep extra precision for important follow-up calculations.
Methods & verification
Formulas use standard mathematical definitions and fixed unit factors where applicable. See our methodology for numerical conventions, rounding, privacy, and limitations.