Inventory Variables
EOQ Optimization
*At perfect EOQ, ordering and holding costs are exactly balanced.
The Economic Order Quantity (EOQ) is a crucial formula in supply chain and inventory management. It helps businesses calculate the ideal order size to minimize the total costs associated with buying and storing inventory.
How the EOQ Formula Works
The EOQ model finds the perfect "sweet spot" where the cost of ordering goods and the cost of storing (holding) those goods are perfectly balanced. If you order too much at once, your holding costs skyrocket. If you order too little, your ordering and shipping costs eat into your profits.
EOQ = √((2 × Annual Demand × Cost per Order) / Holding Cost per Unit)
For example, if you sell 10,000 widgets a year, it costs $50 to process and ship an order, and it costs $2 to store one widget for a year, your optimal EOQ is approximately 707 units per order. At this exact quantity, your annual ordering costs and annual holding costs will perfectly match, resulting in the lowest possible total inventory cost.
How to Use This Tool
- Enter your Annual Demand (the total number of units you expect to sell in a year).
- Enter your Cost per Order (fixed costs like shipping, administrative fees, and handling incurred every time you place an order with a supplier).
- Enter your Holding Cost (the cost to store a single unit in your warehouse for an entire year, including rent, insurance, and depreciation).
- The calculator will instantly provide your optimal order quantity and break down your annual costs.
Frequently Asked Questions
Why are the Annual Ordering Cost and Holding Cost the same?
This is the mathematical magic of the EOQ formula. The absolute minimum total cost curve is achieved at the exact intersection where your ordering costs equal your holding costs. If they are unbalanced, you are either ordering too frequently or holding too much stock.
What are the limitations of EOQ?
The basic EOQ model assumes that consumer demand, ordering costs, and holding costs remain perfectly constant throughout the year. It does not account for seasonal demand spikes, volume discounts from suppliers, or unexpected supply chain delays.