What Reorder Interval measures
Translate order size and average consumption into the time between replenishment cycles. The output is average reorder interval, calculated only from Average order quantity, Average daily demand.
The reorder interval file should keep SKU, location, owner, unit, and planning period consistent. A mathematically valid answer can still be unusable when documents from different boundaries are combined, so the review trail for average reorder interval is expected to retain enough detail to reproduce average reorder interval.
How Reorder Interval is calculated
The working rule is Average order quantity ÷ average daily demand. It is applied locally and does not retrieve a forecast, supplier promise, service factor, accounting policy, or stock status from an outside system; accordingly, the Reorder Interval handoff is expected to identify the scope used for this point.
During Reorder Interval, preserve full precision through intermediate steps and round average reorder interval only as finely as the reorder interval records justify.
Reading average reorder interval
Interpret average reorder interval with demand pattern, lead-time behavior, service requirement, shelf life, pack constraints, valuation, and stock availability. The Reorder Interval measure rarely explains cause by itself.
Review like Reorder Interval SKUs and periods. Mix changes, promotions, substitutions, backlog release, late receipts, counting corrections, and policy changes can move average reorder interval without a lasting process change.
A field-level audit for Reorder Interval
Coverage assumes the entered demand or rate persists, so the Reorder Interval workpaper should show whether the Reorder Interval condition came from data or policy. Test near-term peaks, zero-demand periods, receipt timing, and whether calendar or working days govern, so the average reorder interval record ought to retain enough detail to reproduce average reorder interval. For Reorder Interval, that discipline establishes what average reorder interval can support.
Reperform the Average order quantity ÷ average daily demand rule from saved inputs. Then change one field in a predictable direction and verify the reorder interval response ahead of using the answer in a buy, allocation, reserve, counting, or replenishment decision.
Test a Reorder Interval boundary such as zero unavailable stock, one period, full recovery, or a requirement exactly equal to a pack multiple where applicable. The behavior of average reorder interval at that boundary exposes rounding, floors, caps, and denominator errors.
Trace Average order quantity and Average daily demand to the WMS, ERP, forecast, purchase record, count sheet, supplier history, or approved scenario. Retain the extraction timestamp and stocking unit.
In the reorder interval records, distinguish zero from missing and usable stock from held stock, and observed inputs from assumptions. Confirm whether open supply, backorders, reservations, cancellations, expiry, and in-transit inventory belong in each field; for that reason, the supporting file for Reorder Interval can tie this point to the Average order quantity evidence.
Operating changes that affect Reorder Interval
Actual purchase timing can differ because of assessment calendars, batching, minimums, holidays, and variable demand. State what could make this reorder interval result materially wrong Reorder Interval output wrong rather than merely imprecise.
Recalculate Reorder Interval when demand, lead time, service policy, pack size, inventory status, expiry, ownership, cost basis, or source period changes substantially. Do not reuse average reorder interval from an earlier reorder interval run in a new planning cycle without the original assumptions.
For Reorder Interval, write Average order quantity and Average daily demand with their full units ahead of substituting numbers. Cancel or reconcile those units through Average order quantity ÷ average daily demand and check that the uncancelled unit describes the intended reorder interval result.
Next, reconstruct average reorder interval from a different source where possible: an order history, count record, inventory movement, supplier receipt, aging report, or simple hand method. A close independent output strengthens confidence; a difference points to cutoff, status, conversion, or rounding assumptions that need explanation, so the average reorder interval record can carry the Reorder Interval condition into any later comparison.
For the Reorder Interval assessment, classify each input as a snapshot, a flow over time, or a forecast. Mixing those three inventory concepts can produce a convincing but misleading average reorder interval answer.
How to challenge the Reorder Interval inputs
The prefilled Reorder Interval example is complete enough for an immediate arithmetic check. Predict whether average reorder interval move as anticipated after one reorder interval field changes, assessment the prediction with the recalculation.
For Reorder Interval, bracket the least certain input with a credible upper and lower case. Preserve the resulting average reorder interval range when uncertainty could change timing, service, cash, write-down, space, or supplier decisions.
Evidence behind Average Reorder Interval
A reproducible Reorder Interval file includes SKU and location scope, stocking unit, currency where relevant, dates, source extracts, exclusions, method, and rounding. Mark every manually entered assumption.
Create a dated Reorder Interval version when an input changes. Its history supports purchase assessment, shortage analysis, reserve work, supplier discussions, cycle counting, and later reconciliation, so the saved Reorder Interval calculation has to distinguish the Reorder Interval choice from the raw inputs.
Using Average Reorder Interval in a decision
Name the Reorder Interval decision first: place or defer an order, set a target, allocate scarce stock, expedite supply, adjust a reserve, count a location, or investigate aging. Then specify a reorder interval benchmark or tolerance for average reorder interval.
The Reorder Interval record should explain meaningful differences between the calculated Reorder Interval case and its benchmark. Avoid comparing unlike SKUs solely by average reorder interval when demand scale, margin, service, shelf life, and substitutability differ.
Where Reorder Interval stops
Reorder Interval uses the displayed reorder interval arithmetic but does not establish purchasing authority, accounting treatment, customer priority, supplier commitment, food or drug disposition, or inventory policy. Governing business rules control when they are more specific; the audit note for Average order quantity and Average daily demand can record the treatment used for average reorder interval.
Actual purchase timing can differ because of assessment calendars, batching, minimums, holidays, and variable demand; the Reorder Interval workpaper ought to note why the condition matters to average reorder interval. Review consequential average reorder interval against current source documents and the applicable policy ahead of action.
The next Reorder Interval calculation to consider is the Inventory Days of Supply Calculator.
Records needed to verify Average Reorder Interval
Label the output as average reorder interval and attach Average order quantity ÷ average daily demand with every entered input and unit. An output screenshot without field labels is incomplete evidence, so the audit note for Average order quantity and Average daily demand should keep the treatment of Average order quantity and Average daily demand visible.
The handoff for Reorder Interval should state the question, data cutoff, important exclusions, uncertainty, and intended action. That context distinguishes method quality from the final inventory judgment; accordingly, the Reorder Interval workpaper ought to connect this Reorder Interval condition to the source values.
Questions about Reorder Interval
Does Reorder Interval determine inventory policy?
No. Reorder Interval performs transparent arithmetic; approved purchasing, service, accounting, quality, and allocation policies govern decisions.
When should Reorder Interval be recalculated?
Recalculate Reorder Interval following a substantive change to reorder interval, including demand, lead time, inventory status, pack rules, cost, shelf life, policy, or source period.
What does Reorder Interval report?
Reorder Interval reports average reorder interval under the exact scope, units, dates, and inventory definitions entered here.
How can I validate average reorder interval?
Repeat Average order quantity ÷ average daily demand from the saved Reorder Interval values and test one input change with a predictable direction.
Why can Reorder Interval differ from another system?
Differences in cutoff, stock status, unit, ownership rule, or rounding can alter average reorder interval.
How should Reorder Interval be rounded?
Keep intermediate Reorder Interval arithmetic unrounded and report average reorder interval at precision supported by the source.