Calculate total calendar days, business days (excluding weekends), and total productive working hours between any two dates instantly.
Lead time calculations represent the absolute chronological span of a process. Depending on your industry guidelines, you will calculate lead time in either Calendar Days (standard logistics) or Business Days (professional production schedules).
To automatically calculate business day lead times (completely excluding weekends) in Microsoft Excel or Google Sheets, use the built-in NETWORKDAYS formula, where Cell A1 contains the start date and Cell B1 contains the completion date:
=NETWORKDAYS(A1, B1)
Working Hours Shortcut: To calculate total productive working hours (based on standard 8-hour days), multiply the formula by 8: =NETWORKDAYS(A1, B1) * 8.
In manufacturing, logistics, and Agile project management, professionals draw a strict distinction between **Lead Time** and **Cycle Time**:
A professional supply chain lead time consists of three primary components:
| Component | Description | Typical Metric |
|---|---|---|
| 1. Preprocessing Time | Receiving the order, verifying payments, and creating the task ticket. | Business Hours |
| 2. Processing Time | The active manufacturing, assembly, or development time (Cycle Time). | Business Days |
| 3. Postprocessing Time | Packaging, shipping, transport, and final delivery to the client. | Calendar Days |
Quick answers to common questions about calculating lead times and business days.
Lead Time represents the complete, end-to-end duration from a customer's initial order placement up to the final physical delivery of the product. Cycle Time only measures the internal, active time spent physically manufacturing or working on producing that product, completely excluding any preprocessing wait times or postprocessing shipping durations.
To calculate business days lead time, subtract all Saturdays and Sundays from the total calendar day count. For example, if a process starts on a Monday and concludes on the following Monday, there are 8 total calendar days. Subtracting the weekend (2 days) leaves exactly 6 business days of lead time.
In Excel or Google Sheets, use the built-in formula: =NETWORKDAYS(start_date, end_date). This automatically counts the standard Monday-through-Friday business days between your dates, completely ignoring weekend days. You can also specify an optional range of custom holiday dates to deduct them from your total automatically.
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