Inventory calculators
EOQ, reorder point, safety stock, turnover, service level and fill rate.
Calculate EOQ step by step: EOQ = √(2 × annual demand × cost per order ÷ holding cost per unit per year).
Calculate Reorder Point step by step: reorder point = average daily demand × lead time + safety stock.
Calculate Safety Stock with your chosen method: fixed days of cover, z × σd × √L, or combined demand and lead-time variability.
Calculate Inventory Turnover step by step: cost of goods sold ÷ average inventory.
Calculate Inventory Days step by step: average inventory ÷ cost of goods sold × days in period.
Calculate Carrying Cost step by step: capital cost + storage + insurance and taxes + obsolescence and shrinkage.
Calculate Stock Coverage step by step: (on hand + on order) ÷ expected daily demand.
Calculate cycle service level from measured stock-out-free cycles, or from a z value you choose.
Calculate Fill Rate step by step: units shipped from stock on first attempt ÷ units ordered.
Calculate Economic Batch Quantity step by step: √(2DS ÷ (H × (1 − D ÷ P))).
Calculate the extra annual cost of a supplier minimum order quantity compared with your EOQ.