The database of rumen-degradable and undegradable proteins (RDP-RUP) of feed in Indonesia still needs to be improved. RDP-RUP-based diet has high urgency because it contains metabolizable proteins, an accurate material utilized by ruminants for maintenance, growth, and production. The present research aims to discover the grade of rumen-degradable proteins (RDP) and undegradable proteins (RUP) and the chemical contents in legumes, roughages and concentrates used as cattle feed by farmers from Indonesia. Proximate and Van Soest analyses were used to specify chemical contents. Dry matter and organic matter digestibility, RDP-RUP, and rumen fermentation characteristics were set by in vitro Tilley and Terry Method. The inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) tool was used to determine mineral contents, and the fatty acid profile was determined following the AOCS method. The highest protein contents in legumes were in Calliandra calothyrsus (26.08%) and the lowest in Arachis pintoi (14.36%). In roughages, the highest protein contents were in corn straw (11.04%) and the lowest in rice straw (6.44%). Among concentrates, the highest protein content in soybean meal (40.97%) and the lowest in onggok (4.33%). In legumes, roughages, and concentrates, the highest RDP was in Sesbania grandiflora (79.97%), corn husk (46.83%), and soybean meal (80.67%) while the lowest RDP was in Calopogonium mucunoides (58.19%), rice straw (5.07%) and onggok (37.88%), respectively. In conclusion, knowing the nutrient composition of feed ingredients is helpful for diet formulation. Additionally, we must use RDP and RUP in the composition of ruminant cattle feeds to meet the needs of the animals and rumen microorganisms. Since there is still a need for knowledge on the RDP and RUP of feeds, this study helps create a ruminant livestock diet based on RDP and RUP levels.