Track material needs, buffer stock, and purchase costs. Review cartons, defects, freight, and reorder timing. Make smarter supply plans with cleaner numbers and control.
| Monthly Demand | Unit Cost | Lead Time | Safety Stock | Defect % | Units/Carton | Freight/Carton | Tax % | Order Cost | Carrying % | Storage/Unit | Current Stock |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1200 | 18.50 | 12 | 180 | 3 | 24 | 16 | 5 | 95 | 12 | 0.60 | 320 |
Daily Usage = Monthly Demand ÷ 30
Lead Time Demand = Daily Usage × Lead Time Days
Adjusted Monthly Demand = Monthly Demand × (1 + Defect Rate)
Reorder Point = Lead Time Demand + Safety Stock
EOQ = √((2 × Annual Demand × Order Cost) ÷ Holding Cost Per Unit)
Freight Per Unit = Freight Per Carton ÷ Units Per Carton
Landed Unit Cost = (Unit Cost + Freight Per Unit) × (1 + Tax Rate)
Days Of Cover = Current Stock ÷ Daily Usage
Suggested Order Quantity = EOQ − Current Stock
Enter expected monthly demand first. Add your current unit cost and lead time days. Enter safety stock to protect service levels. Include defect percentage to cover scrap, breakage, or failed inspection units.
Next, add packaging and logistics values. Use units per carton, freight per carton, and tax rate. Then enter order cost, carrying rate, storage cost per unit, and current stock.
Press the calculate button. The tool will show supply results above the form. Review reorder point, economic order quantity, landed cost, days of cover, and suggested order quantity. Use the CSV or PDF buttons to export the result set.
Manufacturing teams need clear supply numbers. Delays hurt output. Overstock raises holding costs. This calculator helps balance both. It estimates adjusted demand, reorder point, and economic order quantity in one view.
Unit price is not the full story. Freight, tax, storage, and carrying charges change the real cost. This tool adds those items. You get a clearer landed unit cost for better purchasing decisions.
Factories often face demand swings, late deliveries, and damaged units. Safety stock and defect rate matter. This calculator uses both values. It helps planners create a stronger inventory buffer without buying blindly.
Reorder point tells you when action is needed. EOQ suggests a practical order size. Together, they improve purchase timing. They also lower rush orders, missed production targets, and excess warehouse pressure.
The calculator is useful for fast supply checks. Buyers can review cartons needed per order. Supervisors can estimate days of cover. Analysts can compare current stock against reorder point and see risk quickly.
This model works for packaging, fasteners, hardware, maintenance items, shop supplies, and repeat-use production materials. It is flexible. You can update any input and recalculate in seconds.
Many teams share numbers with managers or vendors. The export buttons help with that. Download CSV for spreadsheets. Download PDF for quick reporting, print files, or internal review.
Good planning depends on simple, trusted math. This calculator turns raw inventory figures into action. Use it to improve control, lower waste, and support stable manufacturing supply performance every month.
It estimates supply planning values such as adjusted demand, reorder point, economic order quantity, cartons needed, landed unit cost, days of cover, and expected purchase cost.
Defect rate raises required demand to cover damaged, rejected, or unusable units. This helps planners avoid shortages caused by production loss or incoming material problems.
Reorder point is the stock level that signals a new order. It combines expected demand during lead time with extra safety stock for protection.
EOQ means economic order quantity. It estimates a cost-efficient order size by balancing ordering cost and holding cost over the year.
Yes. The tool spreads freight across each unit and then applies tax. This gives a more realistic unit cost for planning and margin review.
Yes. It can help with maintenance items, warehouse consumables, packaging materials, and other repeat-purchase supplies where demand and replenishment matter.
Cartons help buyers convert unit-based order sizes into packaging-based purchase decisions. This is useful when suppliers ship or price goods by carton.
After calculation, use the CSV or PDF buttons. The CSV file works well for spreadsheet analysis. The PDF file is useful for printing and sharing.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.