Parallelogram Area Calculator (Alias) A = b × h. Base Height Area 40 Step-by-step with your numbers: 1. Values used: 2. Base = 8 3. Height = 5 4. Area = Base x Height = 8 x 5 = 40 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Base × height (perpendicular). FAQ Slant? Height is perpendicular, not the slanted side. Related calculators Parallelogram Area Calculator Find the area of a parallelogram. Rectangle Area Calculator Find the area and perimeter of a rectangle. Trapezoid Area Calculator Find the area of a trapezoid.