Finger Tip Unit (FTU) is being considered as a means of quantifying dosages but rough guides are provided in literature and it is without psychometric value. The primary aims of this study were to determine reference values for FTU metric length (FTUML) and compare values of 6 different age groups. 600 participants were purposively recruited. The weight, height and selected anatomic girths were measured using standard procedures. The FTUML was measured from the tip of index finger to the distal palmar crease using an inelastic tape measure. Body Somatotype and BMI were computed. Descriptive and Inferential statistics were used to analyse the data. The mean FTUML for participants between 11 and 20 years, 21 and 30 years and other age groups were 2.5cm, 2.7cm and 2.4cm (SD = 0.3cm each) respectively, There was significant difference between the FTUs of different age groups (F= 15.37, P= 0.001). The FTUML of age group of 21-30 years was significantly higher than that of others (p=0.001). There was significant correlation between FTUML and height, wrist, ankle girths and body Somatotype (r- values= 0.410, 0.234, 0.472 and -0.106 respectively, p<0.01). Age and other independent variables considered were significant predictors of FTUML (F=32.46, P=0.001). The variables contributed 39.9% to the prediction of FTUML. The predictive equation obtained for FTUML was valid (r = 0.63, p = 0.001). It was concluded that the Fingertip Unit Metric Length of the participants ranged between 2.4 and 2.7cm and it differed across different age groups. Age, height, weight, Body Mass Index, girths and somatotype were significant correlates and predictors of Fingertip Units Metric Length