We statistically examined the oral reading fluency of 295 adults with low literacy by analyzing total words read per minute and word error rates. We identified four fluency-ability groupings based on standardized assessments of reading-related skills (phonemic awareness, word recognition, vocabulary, comprehension, and general ability). Our results suggest that adults who read at comparable correct word rates vary significantly in total words read and word error rates. These differences were independent of assessed general ability level. Thus, total words read per minute and word error rates offer a picture of learner reading ability that can help instructors target instruction toward weak reading-related skills. (Contains 7 tables and 3 figures.)