The operational problem
Average demand and quoted lead time are not certain
Sales can accelerate and supplier deliveries can be late. A reorder point based only on average lead-time demand leaves no margin for either event.
Safety stock creates an explicit buffer. Expressing it in days makes the setting easier to reason about across products with different sales rates.
The workflow
Turn a day-based buffer into units
- 1Choose the number of safety-stock days appropriate for the product.
- 2Multiply the product's average daily sales by those days.
- 3Add the resulting unit buffer to expected demand during supplier lead time.
- 4Review the buffer when demand, supplier reliability, or business risk changes.
What Supremo provides
Specific capabilities for this job
- Safety stock configured in days.
- Automatic conversion from days to units.
- Inclusion in the reorder-point formula.
- Per-product settings.
- Visible relationship between demand, lead time, and buffer.
- Manual control for known business conditions.
Example: three days of safety stock
A product sells eight units per day. A three-day safety-stock setting creates a 24-unit buffer. If expected demand during the seven-day supplier lead time is 56 units, the reorder point becomes 80 units.
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 moreHow Supremo calculates safety stock
See the day-to-unit conversion used in the reorder-point formula.
Read morePut the workflow into practice
Connect your Shopify catalog, set supplier and replenishment inputs, and manage purchasing from one place.