Factors influencing lumber yield and value have been identified as the factor influencing the lumber recovery from logs during conversion in the mills. These include log shape (sweep, taper, crooked and straight), log size (girth, and the length) kinds of conversion and processing machine, machine maintenance culture, availability of machine part and experience of the operator. To improve on the lumber recovery, the conversion efficiency of the available functional sawmill must be assessed, hence the research The study was carried out in selected sawmills in Oluyole local government area, Oyo state, Nigeria.. Eight (8) sawmills, namely: Ore Ofe sawmill, Dicktard sawmill, Kolapo sawmill, Tiamiyu sawmill, Manshalau sawmill, Olaoluwa sawmill, Sumibare sawmill and Maleek sawmill all located at Alomoja area in Oluyole local government were sampled. Eighty (80) logs were sampled in all, ten (10) logs sampled randomly in each sawmill. The analysis of the data gathered revealed that Maleek has the highest percentage Lumber recovery of (88.2%) followed by Sumibare (86.4%), Manshalau (85.1%), Olaoluwa (83.7%), Tiamiyu (83.7%), Kolapo (81.7%), Dicktard (78.9%) and Ore-ofe had the lowest percentage Lumber recovery of (70.8%). This pattern variation may be due to log diameter classes, experience of the operator and their method of conversion.It is therefore concluded that the experience of the operator was the major determinant in sawmills and logs of large diameter and fairly straight log characteristics