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The provision of adequate tidal volume (TV) (6 ml/kgBW) based on Predicted Body Weight (PBW) is one of lung protective ventilation measures. In this study we compared TV and PBW from the measurement of body length on supine position (recumbent length) with those obtained from the estimation of body height from ulnar length, demi-span, and knee height (knee height). The sample was obtained from 22 patients aged 17-60 years, who used mechanical ventilation in the Intensive Care Unit in September-October 2017 and met inclusion and exclusion criteria. In all patients, PBW and TV were estimated from the measurement of body length, then compared with PBW and TV from the body length estimation from ulnar length, demi-span and knee height. There were 14 males (mean age 38.6, SD 16.18) and 8 females (mean age 44, SD 12.62) participated in this study. PBW and TV results from body length measurement and estimated body height from knee height (KH) and demi-span (DS) in each sex did not show significant differences. Nevertheless, males showed lower results and females tended to be higher, whereas PBW and TV from ulnar length measurements showed significant differences in both males and females (p <0.005). Demi-span and knee height can be used as alternatives in body height measurements as the basis for measuring predicted body weight and tidal volume in bed confined patients treated at Intensive Care Unit.