How to Use the Rhombus & Parallelogram Area Calculator
Rhombuses and parallelograms both have two pairs of parallel sides, but their areas are found differently. A rhombus's diagonals always cross at a right angle, which gives area = diagonal1 × diagonal2 ÷ 2. A parallelogram's area uses its base and the height measured perpendicular to it: area = base × height. Just pick the shape type above and enter the values that match.
For example, a rhombus with diagonals of 6cm and 8cm has an area of 6×8÷2 = 24cm². A parallelogram with a base of 10cm and a height of 6cm has an area of 10×6 = 60cm². The two shapes can look similar at a glance, but the inputs and formulas differ, so pick whichever mode matches the values you actually have on hand.
A square is a special case of a rhombus, so entering equal diagonal lengths gives a square's area too, and a rectangle is a special case of a parallelogram in the same way. This calculator is handy for architectural drawings, tile layouts, and geometry homework whenever you need a quick area check for a rhombus or parallelogram shape.
Frequently Asked Questions
Rhombus area = diagonal1 × diagonal2 ÷ 2, because the two diagonals always cross at a right angle.
Parallelogram area = base × height, where height is measured perpendicular to the base.
Yes, a square is a special rhombus, so entering equal diagonal lengths gives the square's area too.