A period of crack growth retardation after coalescence of a pair of cracks, propagating under constant amplitude cyclic loading, has been found in previous studies. In this study, quantitative fractography has been used to examine the evolving shapes and sizes of the fracture area of a newly coalesced crack. The size of the remaining area required for two coalesced cracks to form a single semi elliptical crack was found to be associated with the period of crack growth retardation . Based on this relationship, a new fracture area method has been formulated in which accounts for the period of crack growth retardation of a coalesced crack. The crack growth of the newly coalesced crack predicted using the new method agreed well with experimental data.