Inventory Management

What is Economic Order Quantity (EOQ)?

The optimal order quantity that minimizes the total cost of inventory including ordering costs and holding costs.

How It Works

EOQ calculates the ideal quantity to order each time to minimize total inventory costs. Ordering too frequently increases ordering costs (processing, shipping, inspection). Ordering too much increases holding costs (storage, insurance, obsolescence, capital tied up). EOQ finds the sweet spot where total costs are lowest. Assumptions include constant demand, fixed ordering cost, constant holding cost, and no quantity discounts. Despite these simplifications, EOQ provides a practical starting point for inventory management decisions.

Formula

EOQ = √(2 × D × S ÷ H) | Where: D = Annual demand, S = Ordering cost per order, H = Holding cost per unit per year

Real-World Example

A retailer sells 10,000 units/year of a product. Ordering cost: ₹500/order. Holding cost: ₹20/unit/year. EOQ = √(2 × 10,000 × 500 ÷ 20) = √500,000 = 707 units. Optimal orders per year: 10,000 ÷ 707 ≈ 14 orders. Total cost at EOQ: 14 × ₹500 + (707/2) × ₹20 = ₹7,000 + ₹7,070 = ₹14,070.

Why It Matters

1

Ensures accurate financial reporting and record-keeping

2

Helps maintain regulatory and tax compliance

3

Enables better-informed business decisions

4

Improves operational efficiency and cash flow management

Frequently Asked Questions

What are the limitations of EOQ?

EOQ assumes constant demand (ignores seasonality), no quantity discounts (bulk pricing changes the math), instant delivery (no lead time variability), and single product (doesn't consider product interactions). Modern businesses use EOQ as a baseline, then adjust for real-world factors like MOQ, supplier discounts, and demand forecasts.

How does EOQ relate to Reorder Point?

EOQ answers 'HOW MUCH to order' while Reorder Point answers 'WHEN to order.' Reorder Point = (Daily demand × Lead time) + Safety stock. Together they form a complete inventory policy: when stock hits the Reorder Point, place an order of EOQ quantity.

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