Separate quoted lead-time use from a selected stock reserve.
Which part of a reorder trigger is calculated and which part is your assumption?
Use the matching calculator
Use this decision sequence
- Enter currently usable stock on one consistent unit basis.
- Supply a constant daily use estimate and a quoted lead time.
- Enter the reserve quantity selected for your own planning scenario.
- Read stock above or below the resulting trigger without treating it as a demand forecast.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Lead-time consumption | Is daily use multiplied by lead days. |
| Reserve stock | Is an entered allowance, not inferred from uncertainty. |
| Trigger comparison | Depends on those assumptions remaining valid. |
Worked comparison
With entered use of four units per day and ten quoted lead days, lead-time consumption is 40 units. Adding a selected reserve of five units gives a 45-unit trigger. Current stock of 50 units is five units above it and covers 12.5 days at the entered rate. A different demand rate changes every comparison.
Check before using the estimate
No service level, statistical reserve, guaranteed delivery or automatic order date is supplied. The example values are illustrative arithmetic inputs. Replace them with your measured plan, selected product information and actual quote where relevant.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.
Related decisions
Separate ordered, delivered and used concrete quantities
Which quantity should be compared with a supplier invoice?
A positive closing stock balance can hide an earlier shortage
Was enough stock present at every point in the work sequence?
Keep earlier reserve deficits visible after later credits
Can a positive ending contingency balance hide an earlier funding gap?
State whether the starting day is included in lead time
Why can two working days after Friday become five calendar days?