wikiHow Rhombus Area Calculator To find the area of a rhombus, you need to know the length of the diagonals. The formula for the area of a rhombus is: Area = (diagonal 1 x diagonal 2) / 2 1. Here are the steps to find the area of a rhombus using a calculator: 2. Enter the length of the first diagonal into your calculator. 3. Enter the length of the second diagonal into your calculator. 4. Multiply the two diagonals together. 5. Divide the result by 2. For example, let's say you have a rhombus with diagonal 1 measuring 10 cm and diagonal 2 measuring 8 cm. To find the area of this rhombus, you would follow these steps: 1. Enter 10 into your calculator. 2. Enter 8 into your calculator. 3. Multiply the two diagonals together: 10 x 8 = 80. 4. Divide the result by 2: 80 / 2 = 40. So the area of the rhombus is 40 square centimeters. Page