Area of a Rhombus Formula Rhombus looks very much similar to a diamond with all four sides are equal in length and opposite sides are parallel. A rhombus is either an equilateral triangle or a slanting square whose sides are equal and the area can be calculated by multiplying both diagonals together and divide the value by two. Then determine the altitude - the perpendicular distance from the chosen base to the opposite side. The area is the product of these two, or, as a formula: where b is the length of the base a is the altitude (height). Use the calculator below to calculate the area of the rhombus given the base (side) length and altitude (perpendicular height). Area is the size of a surface! Learn more about Area, or try the Area Calculator ...

Then determine the altitude - the perpendicular distance from the chosen base to the opposite side. The area is the product of these two, or, as a formula: where b is the length of the base a is the altitude (height). Use the calculator below to calculate the area of the rhombus given the base (side) length and altitude (perpendicular height). Area is the size of a surface! Learn more about Area, or try the Area Calculator ...