This study was carried out on an adult population in Semi urban communities of Rivers State, Nigeria. The aim of the study is to determine if any relationship exist between blood glucose level and basal metabolic index. The subjects were randomly selected among the population and those who met the inclusion criteria were recruited and used for the study. They were apparently healthy subjects with no known history of a metabolic or any other form of chronic diseases. The sample size included a total of 168 subjects [108 males and 60 females] aged between 18 to 55 years. Clinical history and clinical examination methods were employed for sample/data collection. The height (m) and weight (kg) were measured using a stadiometer. The basal metabolic index (BMI) was calculated using the formula: (weight (kg) / height (m2). Random blood glucose (mg/dl) was obtained using a glucometer. The Statistical Program for Social Sciences (SPSS version 21.0) was used for the analysis. The significance of differences between and among group means was tested using analysis of variance (ANOVA) and multiple group means were compared using the post hoc test. To determine the link between variables, Pearson correlation analysis was used. Statistical significance was defined as a P- value of less than 0.05. In females, there was non-significant very low positive correlation between the blood glucose and the BMI. In addition, the mean level of glucose in blood for the different BMI categories did not show any significant difference when compared to normal BMI. In males, the mean blood glucose levels for all groups including overweight and obesed were not statistically significant when compared to the normal BMI. A Pearson correlation between blood glucose level and BMI indicated a non-significant markedly low positive correlation. In conclusion, it was discovered that there was a positive correlation between BMI and blood glucose levels in adult males and females in this study.