Economic Order Quantity (EOQ) Calculator – Inventory Optimization Tool

Optimize Your Stock: Economic Order Quantity (EOQ) Calculator

Using an Economic Order Quantity (EOQ) calculator is the smartest way for warehouse managers to balance the cost of ordering raw materials with the cost of storing them. EOQ is the ideal order size a company should purchase to minimize its total inventory costs, such as holding costs, shortage costs, and order costs.

In a high-volume manufacturing environment, ordering too frequently increases administrative costs, while ordering too much ties up cash flow. Finding the "sweet spot" ensures your factory remains lean. This is as critical to your bottom line as maintaining high Manufacturing Efficiency and reducing your Break-Even Point.

The EOQ Formula

To find the most cost-effective order quantity, use the following supply chain formula:

EOQ = √ [ (2 × D × S) / H ]

• D (Annual Demand): Total units needed per year.
• S (Order Cost): Fixed cost per order (shipping, handling, admin).
• H (Holding Cost): Cost to store one unit for one year (rent, insurance).

EOQ Calculator

Provided by Industrial Tools Center

Annual Demand (Units):

Order Cost (per order ₹):

Holding Cost (per unit ₹/yr):

Recommended Batch Size:

(Units to order per batch to minimize total cost)

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Frequently Asked Questions (FAQ)

What factors affect the EOQ most?

The three primary drivers are Annual Demand, Ordering Cost, and Holding Cost. If your shipping costs (Order Cost) rise, your EOQ will increase because it becomes cheaper to place fewer, larger orders. Conversely, if your rent (Holding Cost) increases, your EOQ will decrease to keep less stock on hand.

Why is EOQ important for lean manufacturing?

EOQ is a pillar of "Just-In-Time" (JIT) strategies. It helps prevent over-inventory, which is a major waste. By ordering the correct amount, you avoid tying up capital and ensure that raw materials are fresh, reducing the chance of them becoming part of your Scrap Percentage.

Does EOQ assume constant demand?

Yes, the basic EOQ model assumes that demand and lead times are constant. For industries with seasonal fluctuations, managers often combine EOQ with a "Safety Stock" calculation to ensure they never run out of critical components.