Multiple equations developed for a single tree species were combined to produce one predictive equation for a wide range of diameters for each species. The process of combining the individual formulas (each with limited diameter ranges) into one more general species formula produced results that were typically within 2% of the original estimates for total carbon storage of the urban forest (i.e., the estimates using the multiple equations). Formulas were combined to prevent disjointed sequestration estimates that can occur when calculations switch between individual biomass equations.