At the Faculty of Kinesiology in Zagreb, by progressive constant load test on the treadmill, 70 basketball players of Croatian competitive rank had been analyzed (age: 24,37 ± 4,05 years; height: 196,22 ± 9,89 cm; weight: 92,22 ± 12,58 kg; vmax: 17,70 ± 1,47 km/h; vanp: 12,98 ± 1,13 km/h; Δs: 1232,91 ± 278,29 m; FSmax: 187,97 ± 8,24 bpm; FSanp: 165,90 ± 9,02 bpm). The intention of this paper was to calculate the algorithms to evaluate the parameters of aerobic energy capacity (VO2max and RVO2max) with the help of variables which are easily measured without the usage of highly priced sophisticated equipment. Yielded algorithms have proven that with easily available parameters, 78% of the variance of the variable VO2max (r= 0,88; p<0,01), and 58% of the variance of the variable RVO2max (r=0,76; p<0,01) can be explained with minimal estimation error. While planning microcyles, mesocycles and macrocycles, basic parameters are important for estimating aerobic energy capacity to control the intensity during training. With the help of calculated algorithms, coaches can easily access the data about absolute and relative values of maximal oxygen uptake (VO2max and RVO2max) which can significantly ease the process of planning and programming their trainings in the future. The proposed algorithms for the estimation of absolute and relative values of maximal oxygen uptake (VO2max and RVO2max) in this research can be used to control the training of basketball players in everyday practice due to the high correlation coefficients between the results measured in the sports laboratory and the results obtained in testing.