Abstract: A method, system and software product allows the seller of products or services to offer variable pricing while still basing that pricing on the quantity selected by a buyer. It also provides the seller with the ability to adjust the per unit price of any given product or service along a calculated adjustment curve that would exist between price breaks. Two values need to be stored for each plot point on the adjustment curve, the “quantity percentile” and the “price percentile.” To calculate the quantity percentile, the seller determines the difference in quantities between the start price break and the end price break for the specific adjustment curve that is being plotted. The “price percentile” represents the amount of the difference between the start and end price break that will be used to discount the start price breaks price at the quantity level that was calculated in the quantity percentile.