Utility is a subjective concept. Economics Definition HSC 12th Standard.

Economists use the term utility to describe the pleasure or satisfaction that a consumer obtains from his or her consumption of goods and services. Utility is a subjective measure of pleasure or satisfaction that varies from individual to individual according to each individual's preferences. Utility, being a subjective concept, cannot be measured numerically. But it can only be measured ordinally, i.e. in the order of preference.