The research work was accomplished at the laboratories of the field crops in, Krishna College of Agriculture and Technology (KRISAT), Srirengapuram, Usilampatty, Madurai, Tamil Nadu, India during 2017. To study the evaluation of test weight on different categories of field crops like, cereals, millets, small millets, pulses, oilseeds, fiber, narcotics, fodder and green manure crops were counted and computed the data's in this article. The number of seeds was taken in to by hand count on 100 and 1000 seed weight was measured in weighing balance (g/mg). There are five different samples were collected in each and every crop seeds and average values are computed. The values have been used for estimation/working out of seed rate for raising the crops in unit of land. A lower test weight equals to lower value and higher test weights generally fetch the best price and provide the best quality of grains. Test weight is the weight of seeds per unit volume and is expressed in kg per ha.