Add processing, transit and buffer days to an order date to get the total lead time and the expected delivery date.
Result
How to use this tool
Enter the date the order was placed as YYYY-MM-DD.
Enter processing, transit and buffer days separately so each can be managed.
Read the total lead time and the expected delivery date.
Increase the buffer if deliveries keep slipping, or trim it if they consistently arrive early.
Formula & worked example
Ordered 2026-01-01 with 2 processing days, 5 transit days and 1 buffer day: total lead time 8 days, expected delivery 2026-01-09.
Limitations — read this before you rely on it
Calendar-day arithmetic only. It does not skip weekends, public holidays or carrier cut-off times.
Frequently asked questions
The total time from placing an order to receiving it, including processing, shipping and any safety buffer.
Calendar days here. If your promise is in working days, fold weekends and holidays into the buffer.
Supplier delays, customs checks and other variation that processing and transit estimates do not cover.
Yes: treat processing as production time and transit as shipping time.
Buffers cover typical variation, not exceptional disruption; track actuals and adjust the buffer over time.