Economic Order Quantity Model In Inventory Management | Optiwise
Learn the EOQ model, formula, assumptions, benefits, limitations, and how manufacturers can use AICAN Optiwise to improve inventory ordering decisions.
Economic Order Quantity Model in Inventory Management
Ordering too much inventory blocks cash. Ordering too little creates stockouts and urgent purchases.
Manufacturers live between these two pressures every day. Raw material has to be available before production starts, but every extra unit sitting in stores carries cost. Purchase teams may buy in bulk to reduce price or transport cost. Finance may push for lower stock. Production may demand safety. Owners need a practical balance.
The Economic Order Quantity model, or EOQ, helps estimate the order quantity that balances ordering cost and holding cost.
EOQ is not a magic number. It is a decision tool. Used carefully, it helps manufacturers think more clearly about how much to order and when to review purchasing patterns.
AICAN Optiwise helps manufacturers connect inventory, purchase, consumption, and reports so EOQ-style decisions are based on better data.
What Is Economic Order Quantity?
Economic Order Quantity is the order quantity that minimises the total cost of ordering and holding inventory.
It balances two costs:
Ordering cost: the cost of placing and processing orders.
Holding cost: the cost of carrying inventory in storage.
If you order very frequently in small quantities, ordering cost rises. If you order rarely in large quantities, holding cost rises. EOQ finds a balance point.
EOQ Formula
The common EOQ formula is:
EOQ = Square root of (2DS / H)
Where:
D = Annual demand
S = Ordering cost per order
H = Holding cost per unit per year
Example:
Annual demand is 12,000 units.
Ordering cost is Rs 500 per order.
Holding cost is Rs 20 per unit per year.
EOQ = square root of (2 x 12,000 x 500 / 20)
EOQ = square root of 6,00,000
EOQ is about 775 units.
This means the business may consider ordering around 775 units per order, assuming the inputs and assumptions are valid.
Why EOQ Matters for Manufacturers
Manufacturers often buy hundreds or thousands of items. Not every item needs the same purchase logic.
EOQ can help with items that have stable demand, predictable consumption, and measurable ordering and holding costs.
It can reduce overstocking.
It can reduce repeated urgent buying.
It can support reorder planning.
It can improve working capital discipline.
It can help compare supplier minimum order quantities against actual demand.
EOQ Assumptions
EOQ works best when demand is fairly stable.
It assumes ordering cost and holding cost are known.
It assumes replenishment is predictable.
It assumes unit price is constant.
It usually does not account for quantity discounts, expiry, variable lead times, seasonal demand, or supplier constraints unless modified.
This is why manufacturers should use EOQ with judgement.
Limitations of EOQ
EOQ can be misleading if demand is highly variable.
It can ignore supplier minimum order quantities.
It may not account for storage limits.
It may not consider cash flow pressure.
It may not handle critical items where stockout cost is very high.
It may not consider shelf life or expiry.
It may not reflect price breaks or transport consolidation.
The model is useful, but the factory reality must be considered.
EOQ vs Reorder Point
EOQ tells how much to order.
Reorder point tells when to order.
A manufacturer needs both.
Reorder point depends on demand during lead time and safety stock. EOQ depends on ordering and holding cost balance.
If EOQ is 775 units but the reorder point is 300 units, the system should trigger purchase when stock reaches 300 units and suggest an order quantity around 775 units, subject to practical constraints.
How to Use EOQ Practically
Start with high-value or frequently purchased items.
Use clean demand history.
Estimate ordering cost realistically.
Estimate holding cost, including storage, interest, insurance, handling, and risk of deterioration.
Check supplier lead time and MOQ.
Review EOQ quarterly or when demand changes.
Do not apply EOQ blindly to every SKU.
Optiwise by AICAN helps because EOQ depends on accurate inventory and purchase data.
Founder’s Note
Inventory decisions often become emotional. Production wants more. Finance wants less. Purchase wants efficiency. EOQ gives the conversation a starting point.
At AICAN, we believe models are useful when they are connected to real data. Optiwise is built to help manufacturers make these decisions with better visibility.
FAQs
What is EOQ?
EOQ stands for Economic Order Quantity. It estimates the order quantity that minimises ordering and holding costs.
What is the EOQ formula?
EOQ = square root of (2DS / H), where D is demand, S is ordering cost, and H is holding cost.
Is EOQ suitable for all inventory items?
No. EOQ works best for items with stable demand and measurable costs. It should be adjusted for practical constraints.
What is the difference between EOQ and reorder point?
EOQ tells how much to order. Reorder point tells when to order.
How does Optiwise help with EOQ?
Optiwise connects inventory, purchase, consumption, and reports, giving manufacturers better data for order quantity decisions.
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