Vertical jump height is a method of assessing muscle strength and power in the lower body, and is used to assess athletic ability. The gold standard in measuring vertical jump height is the measurement of vertical centre of mass (COM) displacement from three-dimensional (3D) video analysis. Vertical jump height is ultimately affected by takeoff COM velocity, as greater takeoff velocity results in greater jump height. The current study explored the use of takeoff versus maximum COM velocity by examining the relationships and differences between 3D video analysis and 3D force platform analysis when predicting vertical COM displacement. Use of the Vertec, and correction of takeoff COM velocity using takeoff position, was explored through methods proposed by Aragon-Vargas (2000) and Moir (2008). Measurements were taken simultaneously on a single countermovement jump trial for 13 female varsity volleyball players. Centre of mass displacement from video analysis revealed the strongest correlation with jump height from maximum COM velocity, r=0.907, p=0.000. Use of repeated measures analysis of variance (ANOVA) revealed statistically significant differences between jump heights computed by each of the explored methods, F(1,12)=1073.421, p=0.000. Linear regression suggested that, of the explored methods, maximum COM velocity explained the greatest proportion of the variance in vertical COM displacement from video analysis (R²=0.822) and the lowest mean square error (0.023m), when compared to conventional methods of jump height determination. Use of maximum COM velocity in computing vertical COM displacement therefore showed evidence of concurrent validity with 3D video analysis. The outcome of this study will allow future assessments of vertical COM displacement to be computed with greater ease and with less measurement error. This will have implications for researchers and sport organizations to better measure athletes’ performance from force platform analysis alone.