Lead Time Calculator

Adjust the calculator values below

Lead-time result 8 days
Workflow Manufacturing lead time
Pre-processing time 1 day
Processing time 5 days
Post-processing time 2 days
Processing share of total 62.5%
Total hours 192 hours
Formula Pre-processing + processing + post-processing
8 days
Manufacturing lead time 1 day pre-processing + 5 days processing + 2 days post-processing
Other Calculator

Lead Time Calculator

Calculate manufacturing, order, or supply-chain lead time with conditional workflows, mixed duration units, and calendar-date forecasting.

Keep the three lead-time workflows separate

Manufacturing lead time adds pre-processing, active processing, and post-processing. Order lead time compares an order date with a delivery date or forecasts delivery from a stated interval. Supply-chain lead time adds supply delay and reorder delay. The inputs are conditional because these formulas answer different questions.

Manufacturing lead time includes more than cycle time

Manufacturing lead time equals pre-processing plus processing plus post-processing. Processing time is the cycle-time component only. Reporting its share of the total helps show whether waiting and handoff time or active production is the larger contributor.

Use elapsed calendar days for orders

A forecast adds the stated whole calendar-day interval to the order date; zero days returns the same date. Actual order lead time subtracts the order date from the delivery date, so July 1 to July 15 is 14 elapsed days. Weekends and holidays are included, and the order date is not counted as an extra day.

Supply-chain lead time adds two inventory delays

Supply-chain lead time equals supply delay plus reorder delay. The published example combines a 1-day supply delay with a 14-day reorder delay for a 15-day total. This simplified planning relationship does not model demand variability or safety stock.

Document the calendar and operational assumptions

Real delivery can depend on business-day calendars, cut-off times, time zones, supplier variability, queues, batching, transport, inspections, partial shipments, disruptions, and service-level rules. Treat the result as a transparent planning estimate and apply the organization's written convention for commitments.

Frequently asked questions

Common questions about manufacturing, order, and supply-chain lead time, cycle time, elapsed calendar days, mixed units, and operational delays.

How is manufacturing lead time calculated?

Add pre-processing, processing, and post-processing time. For example, 1 day of preparation, 5 days of production, and 2 days after production produce an 8-day manufacturing lead time.

Is cycle time the same as manufacturing lead time?

No. Cycle time is the active processing component. Manufacturing lead time also includes work before and after processing, so it is normally at least as long as cycle time.

How do I forecast an order delivery date?

Add the stated whole calendar-day lead time to the order date. This calculator treats day 0 as the order date and includes weekends and holidays unless your organization applies a different calendar.

How is actual order lead time counted?

Subtract the order date from the delivery date. July 1 to July 15 is 14 elapsed calendar days because the order date is excluded and the delivery date completes the interval.

How is supply-chain lead time calculated?

Add supply delay and reorder delay. The published example uses a 1-day supply delay plus a 14-day reorder delay, giving 15 days.

Can I mix minutes, hours, days, and weeks?

Yes for manufacturing and supply-chain durations. Each component is converted to a common duration before addition, and you can display the result in minutes, hours, days, or weeks.

Why might the real lead time be longer?

Queues, batching, cut-off times, supplier variation, weekends, holidays, inspections, transport, partial shipments, and disruptions can all add time. Use the relevant business calendar and service rules for commitments.