The purpose of this study was to determine the relationship between percentages (75; 85 and95%) of one repetition maximum (1RM) and number of repetitions during back squat; benchpress; and arm curl; especially using free weight in trained and untrained males. Nine trained(T) and 9 untrained (UT) males participated in this study. Subjects performed one set to failureat 75; 85; and 95% of 1RM; after determined the 1RM. Data were analyzed using two- wayanalysis of variance with repeated measures. There was significant difference (p < 0.05)between T and UT at 85% of 1RM at arm curl. Both groups performed significantly (p < 0.05)more repetitions during 75% of 1RM than 85 and 95% of 1RM (75 > 85 > 95%). The rating ofperceived exertion (RPE) was greater (p < 0.05) for high intensity than moderate intensity. Inconclusion; the number of repetitions is dependent to amount of muscle mass and exerciseintensity.