An attempt has been made to investigate a correlation of power consumption in a laminar region which is based on numerical analysis of two-dimensional flow for paddle impeller in an agitated vessel using geometrical parameters derived theoretically from the govering equations and boundary conditions. It is suggested that the proposed model can be widely adapted from large impeller which has small clearance to small impeller which has large clearance between impellers and agitated wall. Also, a modified model was proposed by introducing correction factors with impeller geometries, which can be applied to paddle, anchor and helical ribbon impellers.