What is the formula to calculate flow efficiency?

Flow efficiency is the ratio of the total time spent in value-added work activities divided by the total flow time. Flow time is the time it takes for a work item to move from the start to the end of the process. Value-added work activities are those that directly contribute to the customer value or the quality of the product. Non-value-added work activities are those that do not add value to the customer or the product, such as waiting, rework, or handoffs. Flow efficiency measures how well the organization is minimizing the non-value-added work and maximizing the value-added work. The formula to calculate flow efficiency is:

Flow efficiency=Flow timeTotal active time​×100%

A higher flow efficiency indicates a more streamlined and effective process, while a lower flow efficiency indicates a more wasteful and inefficient process. Flow efficiency can be used to identify and eliminate the sources of waste and improve the flow of value to the customer1234. References: Flow Efficiency - Scaled Agile Framework, Flow Efficiency: A great metric you probably aren’t using, Flow Efficiency: A Great Metric You Probably Aren’t Using - Nimblework, Flow Efficiency: A Kanban Metric Introduction - Everyday Kanban