kasutegur

Kasutegur, literally “usefulness factor” in Estonian, is a term used to describe how effectively resources are converted into useful output. Because its precise meaning depends on the context, kasutegur is usually defined as a ratio or rate that quantifies performance.

In engineering and energy systems, kasutegur is often synonymous with efficiency: the ratio of useful output (such as useful work or delivered energy) to the total input. It is typically expressed as a percentage. Examples include the efficiency of motors, turbines, and light bulbs, where higher kasutegur means less energy wasted as heat or other losses.

In operations and production, kasutegur can refer to utilization or capacity usage—the proportion of available time, space, or equipment that is actually productive. For example, a machine that operates for six hours in an eight-hour shift has a utilization of 75%.

In design and economics, kasutegur may describe the practical usefulness or value delivered by a product, service, or process. It often involves trade-offs between performance, cost, reliability, and user experience.

Calculation and interpretation: the general form is useful output divided by total input. The result is typically expressed as a fraction or percentage, with higher values indicating better performance. However, definitions of what counts as 'useful output' and 'input' vary by field, so definitions should be stated explicitly in any analysis.

See also: efficiency, utilization, performance metric.