A seat foam inspection gage including a foam displacement indicator is used for inspecting seat foam on site at a manufacturing plant. The seat foam inspection gage includes a cylindrical body and a ball arranged within the body. The seat foam inspection gage also includes an indicator arranged on a top surface of the body, wherein the indicator measures distance of a foam displacement of the seat foam at a seat manufacturing facility. The seat foam inspection gage may take the distance of foam displacement and convert that number into an IFD number, thus allowing for quick comparison of seat foam hardness across an entire seating surface and across all seats being manufactured in a facility without having to send the seat foam to an offsite quality control lab to measure the IFD with large frame machinery.