Arkansas Net Energy (Ark NE) is a NE system for ingredients, diet and feed additives that provides actual productive energy (PE) and is dependent upon genetics, age, environment and nutrient content. The advantage of utilizing Ark NE instead of AMEn and Classic NE is the Ark NE system measures actual net energy utilized for maintenance (NEm) and gain (NEg). Broilers need a dietary energy system that reflects performance, high protein gains and body composition consisting of a high percentage of protein mass. Soybean meal (SBM) is an important protein source for broiler diets because it contains high quality protein with excellent amino acid digestibility. Diets with increasing SBM inclusions were used to determine the Ark NE, performance, and body composition of broilers for 56 days using dual energy x-ray absorptiometry (DEXA) and indirect calorimetry. A total of 2,616 fast-growing male broilers were randomly assigned to 96 floor pens for 56 day feeding study with 5 dietary phases. In each dietary phase, broilers were given a corn-soybean meal basal diet formulated with three different inclusion levels of SBM to determine the Ark NE and nutritive value of experimental diets. Data were subjected to a one-way ANOVA and Tukey’s HSD to compare separate treatment means with significance set at 0.05 using JMP pro 15.2 (SAS Institute, 2018). A linear regression model was used to establish the Ark NE value of diets and SBM. Using the Ark NE equation, broiler performance including protein and fat mass gain was higher (P < 0.05) for broilers fed the highest SBM level compared to lower SBM inclusions in each feeding- phase. For each gram increase in SBM intake/broiler, the predicted broiler protein mass increased by 0.43, 0.38, 0.36, 0.47 and 0.25 grams, and the predicted broiler fat mass increased by 0.02, 0.19, 0.19, 0.12, and 0.09 grams in starter, grower, finisher I, II and III, respectively. Consequently, the Ark NE values of SBM were 1401.32, 1950.75, 2046.27, 2140.66 and 2718.26 kcal/kg in starter, grower, finisher I, II and III. Additionally, Ark NE: AMEn ratios of SBM were 68.29, 92.89, 99.51, 105.32 and 133.68 in starter, grower, finisher I, II and III, respectively.