Labor productivity is calculated as:

Labor productivity is effectively measured by determining how many units are produced in relation to the hours that workers spend to generate those units. This metric reflects the efficiency and effectiveness of labor within a production environment. By using the formula of units produced divided by hours worked, organizations can assess their labor performance and make adjustments to improve productivity if necessary.

Other options do present concepts related to productivity and efficiency but do not accurately define labor productivity itself. For instance, while total production divided by the number of workers can give insight into workforce output, it does not account for the actual time each worker puts in, which is critical for understanding productivity in terms of labor resources. Similarly, relating hours worked to machine efficiency provides valuable information regarding the operational performance of machinery rather than labor input. Therefore, the most accurate calculation of labor productivity is found in the relationship between units produced and hours worked.