FinTech Glossary

What is Economic Order Quantity?

Economic Order Quantity, or EOQ, is an inventory management formula that helps a business decide the most cost-efficient quantity to order at one time. It balances two types of cost: ordering cost and holding cost.

In simple terms, EOQ answers this question: “How much inventory should we order so that we do not order too frequently and do not hold too much stock?”

Ordering too little can increase administrative and logistics costs because the business places orders repeatedly. Ordering too much can block working capital, increase storage cost, and create risk of damage, expiry, or obsolescence.

EOQ is especially useful for:

• Manufacturers

• Distributors

• Retailers

• Warehouses

• E-commerce sellers

• Spare parts businesses

• FMCG and pharma stockists

• Procurement teams managing repeat-purchase items

EOQ does not remove the need for business judgment. It gives a disciplined starting point for procurement decisions, especially when demand is predictable and ordering and holding costs can be estimated.

How is EOQ calculated?

The standard EOQ formula is:

EOQ = √(2DS ÷ H)

Where:

• D = Annual demand

• S = Ordering cost per order

• H = Holding cost per unit per year

Example:

A business sells 12,000 units of a product per year.

The cost of placing one order is ₹1,000.

The holding cost is ₹20 per unit per year.

EOQ = √(2 × 12,000 × 1,000 ÷ 20)

EOQ = √12,00,000

EOQ is approximately 1,095 units

This means the business may reduce total inventory cost by ordering around 1,095 units at a time, assuming demand and costs remain stable.

EOQ works best when:

• Demand is reasonably predictable

• Ordering cost can be estimated

• Holding cost can be estimated

• Supplier lead time is stable

• Stockouts are costly but avoidable

• The product is not highly seasonal or perishable without adjustment

Business context and examples

EOQ helps procurement and finance teams make better inventory decisions.

Examples:

• Retail:

A retailer selling fast-moving packaged goods can use EOQ to decide replenishment quantity instead of ordering randomly.

• Manufacturing:

A factory can use EOQ for raw materials that are consumed regularly, such as packaging material, chemicals, or components.

• E-commerce:

A seller can avoid overstocking slow-moving SKUs and understocking high-demand items by combining EOQ with sales velocity data.

• Spare parts:

A maintenance team can use EOQ for frequently used parts so operations do not stop due to stockouts.

• Distribution:

A distributor can decide how much inventory to order from a principal company to balance warehousing costs and availability.

EOQ is also linked to working capital management. Excess inventory ties up cash that could be used for payroll, vendor payments, marketing, debt repayment, or expansion. A lower inventory level may improve cash flow, but only if it does not increase stockout risk.

Why EOQ matters for businesses

EOQ matters because inventory decisions directly affect cash flow, margins, and customer service.

Benefits:

• Reduces unnecessary inventory holding cost

• Lowers frequent ordering and logistics costs

• Improves procurement planning

• Helps avoid overstocking and stockouts

• Supports better working capital management

• Makes purchase decisions more data-driven

• Improves coordination between finance, sales, and operations

Limitations:

• EOQ assumes stable demand, which may not hold in seasonal businesses.

• It does not automatically account for supplier discounts.

• It may not work well for perishable items without adjustments.

• Lead time variability and sudden demand spikes need separate safety stock planning.

• It should be reviewed when prices, storage costs, or demand patterns change.