A new phenomenological compacting equation has been proposed. The equation is ln(1/(1 - D)) = A rootP + B where P is the applied pressure, D is the relative density of the compact, A is a parameter related to densification of the compact by plastic deformation, and B is a parameter related to powder density at the start of compaction. Linear regression analysis has been used to compare the new equation with the four compacting equations often used and proposed by Balshin, Heckel, Kawakita and Ge. The results show that the new equation gives linear correlation coefficients very close to unity. This equation, together with parameters A and B, permits improved evaluation of the compacting characteristics, compared to that performed by other equations.