Top Inventory Control Techniques for E-commerce Success

Inventory control techniques help you manage stock levels, ordering, storing, and tracking products throughout your brand, as well as oversee the entire flow of your products from procurement to final customer delivery. The core principle of inventory control is about achieving the perfect balance between storing sufficient stock to meet customer demand and avoiding excess inventory that might eat up your capital. Today, most brands operate across multiple sales channels, manage diverse product portfolios, and serve customers with varying delivery expectations.

Importance of Inventory Control for E-commerce Businesses

Inventories typically represent 50%-70% of total capital investment for most brands. Therefore, reduction of cost is main aspect to be competitive in market using inventory management. Improvement of profits and improvement of efficiency of a firm are key consequences companies have experienced from following proper inventory control techniques. In an environment where supply chain issues are becoming the new normal, having a strong inventory management system and strategy becomes even more essential.

Key Inventory Cost Components

Cost Type	Description and Business Impact
Purchase cost	The largest part of the inventory investment.
Carrying cost	Can reach 25-35% of actual inventory cost, including storage fees, insurance, handling expenses, and obsolescence.
Shortage cost	Lost sales, negative reviews, and customers switching to competitors.
Ordering cost	Administrative expenses for placing orders.

The purchase cost and carrying cost are inversely related. If you reduce one, the other will grow; however, there's an optimal point where both costs are balanced.

Core Inventory Control Principles and Methods

The objective of inventory control is to have enough amounts of materials in the right place, at the right time, and at a low cost. To achieve this, several proven techniques are utilized by e-commerce businesses.

ABC Inventory Classification

Known as Always Better Control (ABC) based upon Pareto rule (80/20 rule), this model divides inventory into three classes based on annual dollar volume:

• Class A - high annual dollar volume.
• Class B - medium annual dollar volume.
• Class C - low annual dollar volume.

This method is used to establish policies that focus on the few critical parts and not the many trivial ones.

Fixed Size Ordering System (Q System)

The fixed order quantity, or Q system, operates through ordering a fixed quantity of materials when the stock on hand reaches a pre-determine reorder point. It is also called Ordering Point System because an order is issued at the time of reaching the Reorder Point. In this system, when the number reaches ROP (Reorder Point), an order of EOQ (Economic Order Quantity) is placed. The economic order quantity is the optimal amount of inventory your business should order to keep costs as low as possible.

Fixed Order Period System (P System)

The fixed order period, or P system, operates where you order a varying amount of inventory at fixed time internals. Whereas in the Q system you always order a fixed amount of inventory (EoQ) at variable times, the P system will be ordering at fixed time intervals with a new EoQ calculated each time up to the max holding quantity. This leads to better supplier relationships as they get guaranteed, recurring sales.

Just-in-Time (JIT) and Safety Stock

Just-in-Time (JIT) is a technique in which brands receive inventory on an as-needed basis instead of ordering in bulk at once which often leads to dead stock. It can achieve material arrangement Just in Time, which is impossible in other MRP system. To manage risks, businesses also use safety stock, which protects you against sudden demand spikes or supply disruptions that could otherwise halt operations.

Understanding Inventory Categories

Inventory is quite a general term. Below is a breakdown of the specific types of inventory held by firms:

• Raw Materials – Basic inputs that are converted into finished product through the manufacturing process.
• Work-in-progress – Semi-manufactured products that need some more works before they become finished goods for sale.
• Finished Goods – Completely manufactured products ready for sale to customers.
• Supplies – Office and plant materials that do not directly enter production but are necessary for the production process.

Inventory Flow: FIFO and LIFO

For inventory management models, businesses must choose a flow technique. FIFO (First In, First Out) means the first products that enter your warehouse must be shipped out to end users first, which helps ensure older inventory is sold before newer stock, reducing waste and obsolescence. Similarly, LIFO (Last In, First Out) means the last products are sold first, to keep the inventory fresh.