What Is Total Utility?
Total utility is an economics concept describing the complete satisfaction a consumer receives from consuming a certain amount of a good or service. It measures the whole benefit of consumption, not the benefit of any single unit. Economists use the idea of utility to describe satisfaction in an abstract way, since it cannot be measured directly in dollars or other units.
How Total Utility Works
Total utility is built up from the marginal utility of each unit consumed. Marginal utility is the extra satisfaction gained from one more unit. Adding the marginal utility of every unit consumed gives the total:
Total Utility = sum of the marginal utilities of all units consumed
As a person consumes more of something, total utility usually rises. However, it tends to rise at a slowing pace because of diminishing marginal utility: each additional unit typically adds less satisfaction than the one before. Eventually, an extra unit may add nothing, and total utility levels off at its highest point. If consumption goes further, the extra unit may even reduce satisfaction, so total utility falls.
Example
Imagine a person eating slices of pizza. The first slice might provide a large amount of satisfaction, the second a little less, and the third less still. Total utility after one slice is the first slice's satisfaction; after two slices it is the first plus the second; and so on. Plotting total utility against quantity typically produces a curve that rises and then flattens.
Why It Matters
Total utility helps economists explain consumer choice. Because resources such as income are limited, choosing to spend on one good means giving up the satisfaction of another, which is the opportunity cost of that choice. Comparing marginal utilities per dollar spent, within a budget constraint, is a common way to model how consumers allocate their spending.
Total utility also helps explain why people can value an entire category of goods, such as water, very highly while paying little for each additional unit. It is a theoretical tool rather than something observed directly, so its main use is in economic analysis rather than in investment decisions.
Updated November 9, 2026. For general education only; not financial, tax or legal advice.