Shipping factors for imperial measurements represent cubic inches per pound (in3/lb) while metric factors represent cubic centimeters per kilogram (cm3/kg). These are the inverse of the package density. Dimensional weight is applied when the actual product density is less than the minimum density represented by the chosen factor. Dimensional weight is representative of the weight of the package at the minimum density accepted by the freight carrier. Shipping factors are not only different for imperial and metric measurements, but also for shipment mode and in some cases between different customers. Shipping factors will be available from the freight carrier. Some common factors are listed below.