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Feedlot calves were individually fed to determine the phosphorus required for optimum performance during a 204-day experiment. The base diet consisted of high-moisture corn and corn starch/fiber with P treatments of 0.16, 0.22, 0.28, 0.34, and 0.40% of diet DM. Calves fed 0.16% P had the lowest plasma P but it was adequate (5.7 mg/dL). Bone mineral was not influenced by treatment, suggesting that dietary P was adequate to meet performance needs. Supplementation of P is unnecessary because requirements are less than 0.16% of the diet DM.