Free Inventory Forecast & Reorder Point Calculator UK (2026)
Accurately predict stockouts, calculate reorder points, and optimise inventory decisions using demand trends, lead time, and safety stock modelling.
Built for UK retailers, eCommerce businesses, wholesalers, and inventory managers.
Inventory Forecasting Tool
Estimated Days Until Stockout
0
Recommended Reorder Quantity
0
How This Inventory Forecast Calculator Works
This tool uses a demand-based forecasting model to estimate future stock depletion. It adjusts daily sales using trend data, then calculates how long current inventory will last and when you should reorder.
Inventory Forecasting Formula Explained
The calculator adjusts average daily sales based on trend percentage, then applies lead time and safety stock to determine reorder requirements.
- Adjusted Demand = Daily Sales × (1 + Trend)
- Lead Time Demand = Adjusted Demand × Lead Time
- Safety Stock = Lead Time Demand × Safety Percentage
- Reorder Point = Lead Time Demand + Safety Stock
Real-World Example
A UK retailer selling 20 units per day with 7-day supplier lead time and increasing demand (+10%) would need to reorder before stock drops below critical levels. This prevents lost sales and improves cash flow planning.
Who Should Use This Tool?
- UK retail stores managing physical inventory
- eCommerce businesses forecasting demand
- Wholesale distributors managing bulk stock
- Supply chain and procurement teams
Common Inventory Mistakes
- Ignoring seasonal demand changes
- Not updating sales trends regularly
- Underestimating supplier lead times
- Failing to maintain safety stock buffers
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