§ 07 · Interactive
Formula Playground
Plug in your own numbers and watch the classic supply chain formulas recalculate live. Save presets to revisit your scenarios.
Inventory · Ordering
Economic Order Quantity
EOQ = √(2DS / H)
Presetsnone saved
units
$/order
$/unit/yr
Optimal order qty
500 units
Orders per year
20
Total annual cost
$2,000
Inventory · Buffering
Safety Stock & Reorder Point
SS = z × σd × √L · ROP = (d̄ × L) + SS
Presetsnone saved
units
periods
units/period
Safety stock
99 units
Reorder point
999 units
Inventory · Replenishment
Reorder Point
ROP = (d̄ × L) + Safety Stock
Presetsnone saved
units/period
periods
units
Lead-time demand
900 units
Reorder point
999 units
Inventory · Planning
Lead-Time Demand
LTD = d̄ × L
Presetsnone saved
units/period
periods
Expected demand during lead time
1,750 units
Analytics · Efficiency
Inventory Turnover
Turns = COGS / Avg Inventory · Days = 365 / Turns
Presetsnone saved
$
$
Turnover
6×/yr
Days of supply
61 days