To calculate manufacturing lead time, the following formula is used: Lead Time = Pre-processing + Processing + Post-processing For example, if a task requires 1. 5 days for pre-processing, 3. 5. Choose a start date to estimate when the project is completed. Once you have placed your order, we will reach out to reconfirm the details. However, many people often misinterpret these metrics with some of its closest formulas like takt time and lead time. Cycle time, lead time, and. Custom packaging production time (also called "lead time") is the total duration from when you submit your design specifications until your packaging is ready for shipment. This includes the design phase, sampling (optional), mass production, quality control, and packaging— but excludes shipping. Manufacturing lead time calculators help business leaders determine whether or not a delay or adding a new service provider will also be a costly choice. Below we've developed three different calculators: A post-production and packaging lead time calculator that calculates the impact of outsourcing. The Lead Time Calculator allows you to calculate the time required for processing, production and delivery in different business contexts.