Reorder Quantity Planner
Calculate a stock top-up to a target number of supply days.
Your inputs
Calculation results
Formula & assumptions
Order = ceiling(max(0, target demand − available)/pack size) × pack size.
Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.
Compare your scenarios
Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.
Using Reorder Quantity Planner
Calculate a stock top-up to a target number of supply days.
- Enter daily demand, target coverage, available stock, pack size using the units printed under each field.
- Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
- Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.
Example
Daily demand: 30 items Target coverage: 21 days Available stock: 250 items Pack size: 12 items Target stock · items: 630 Packs to order: 32 Order quantity · items: 32 Stock after order · items: 634
Questions & answers
What does Reorder Quantity Planner calculate?
Calculate a stock top-up to a target number of supply days.
Which units should I enter?
Daily demand uses items. Target coverage uses days. Available stock uses items. Pack size uses items. Convert values to these units before calculating.
Which formula does it use?
Order = ceiling(max(0, target demand − available)/pack size) × pack size.
What does the included example show?
Daily demand: 30 items; Target coverage: 21 days; Available stock: 250 items; Pack size: 12 items. Result: Target stock · items = 630; Packs to order = 32; Order quantity · items = 32; Stock after order · items = 634.
Can I compare different settings?
Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.
Can I export the calculation?
Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.
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