Geometry worksheets for calculating volume and area of rectangular prisms. The volume formula to calculate the volume for a rectangular prism is V = l x w x h This will give you the surface area of the rectangular prism. These geometry worksheets are common core for middle grade students. The volume and area worksheets have answers on the second page. To calculate the area of a rectangular prism, use: A=2(l+w+h) It is helpful to understand and learn the formulas for surface area and volumes.