The operational problem
A buffer needs a practical unit of control
A fixed unit buffer means different things for fast and slow products. Days of demand make the intent easier to understand.
The conversion still remains visible and deterministic.
The workflow
The safety-stock conversion
- 1Select safety-stock days.
- 2Calculate average daily sales.
- 3Multiply days by the sales rate to produce safety-stock units.
- 4Add those units to expected demand during supplier lead time.
What Supremo provides
Specific capabilities for this job
- Day-based merchant input.
- Automatic unit conversion.
- SKU-level result.
- Visible inclusion in reorder points.
- Hourly recalculation with velocity.
- Manual adjustment.
Fit boundary: The merchant chooses the safety-stock duration. Supremo does not claim to statistically optimize that choice.
Worked example
At eight units per day, three safety-stock days equal 24 units. Those 24 units are added to lead-time demand.
Frequently asked questions
Related Supremo resources
Reorder point definition
See how lead-time demand and safety stock combine.
Read moreReorder point calculator
Try the formula with your own daily sales, lead time, and buffer.
Read moreHow reorder points work
Follow the complete calculation from sales rate to threshold.
Read moreSales velocity
Understand the demand-rate input used to convert buffer days into units.
Read morePut the workflow into practice
Connect your Shopify catalog, set supplier and replenishment inputs, and manage purchasing from one place.