Formulae

Total Cost = Buying Cost + Carrying Cost + Ordering Cost

EOQ = `\sqrt{\frac{2AO}C}`

☑ Reorder Level (ROL)
⟶ Maximum Consumption `\times` Maximum Lead Time
⟶ Minimum Level + Consumption during Lead Time (i.e. Normal Consumption `\times` Normal Lead Time)
⟶ Safety Stock + Consumption during Lead Time (i.e. Normal Consumption `\times` Normal Lead Time)

Consumption during Lead Time = Average Consumption `\times` Average Lead Time

Maximum Level
⟶ ROL + ROQ - (Min. Consumption `\times` Min. Lead Time)
⟶ EOQ/ROQ + Safety Stock

Minimum Level = ROL - (Normal Consumption`\times`Normal Lead Time)

Danger Level
⟶ Normal Consumption`\times`Max. Lead Time for Emergency Purchases 
⟶ Min. Consumption`\times`Emergency Delivery Time

Average Stock Level
⟶ (Maximum Level + Minimum Level) / 2
⟶ Min. Level + (1`\div`2 `\times` EOQ)

Safety Stock = Annual Demand`\div`365 `\times` No. of days

Reserve Inventory or Buffer Stock = (Max. daily usage - Avg. daily usage) `\times` Lead Time

Inventory Turnover Ratio = Raw Material Consumed during the Period `\div` Average Stock during the Period

☑ Inventory Turnover Period = 365 `\div` Inventory Turnover Ratio

Material Issue Price 
⟶ Simple Average Price Method = Total of Unit price of each purchase `\div` Total No. of purchases
⟶ Weighted Average Price Method = Total Cost of materials in stock `\div` Total Quantity of Materials

Average Inventory = Total Carrying Cost `\div` Carrying Cost Per Unit

Total Carrying Cost = Carrying Cost Per Unit `\times` EOQ `\div` 2