Efficiency is a measure of how well a system or process is performing. It is often expressed as a ratio or percentage of output to input. In other words, it is a measure of how much work is done compared to the amount of energy or resources used. Calculating efficiency can help businesses identify areas where they can save money and resources, and improve their overall performance. It can also be used to compare different systems or processes to determine which one is more efficient. Efficiency calculations involve measuring the amount of input, such as energy or resources, and the amount of output, such as products or services. The ratio of output to input is then used to determine the efficiency of the system or process.