Reorder Level
What is the reorder level?
Reorder level is the stock quantity at which a business seeks to place a fresh purchase order so that replacement stock arrives before the existing quantity runs out. It is calculated as:
Reorder Level = (Average Daily Usage × Lead Time) + Safety Stock
As usage patterns and supplier lead times differ across products, the reorder level is usually set separately for each stock item. Some businesses group similar items, but only where lead times and demand patterns are nearly identical.
Why is reorder level important?
A well-calculated reorder level helps protect a business from two problems at once. It lowers the risk of stockouts, which can result in lost sales and dissatisfied customers. At the same time, it limits overstocking, which locks up cash that could otherwise fund operations.
It also cuts down on emergency or rush orders, which usually involve higher freight and procurement costs than a routine purchase order placed with adequate lead time. For businesses tracking inventory management closely, the reorder level acts as an early trigger that keeps procurement decisions automated, timely, and cost-effective.
How does reorder level work?
Calculating and applying a reorder level follows a consistent sequence, though the inputs vary by business and product.
1. Measuring average daily usage
The business studies historical sales or consumption data, commonly over the last 30 to 90 days, to find how many units of an item move per day on average.
2. Estimating supplier lead time
The time between placing a purchase order and receiving stock is recorded, factoring in supplier processing time, transit and any inspection or clearance steps.
3. Calculating safety stock
Safety stock is worked out to cover demand spikes or delivery delays, using the formula:
Safety Stock = (Maximum Daily Usage x Maximum Lead Time) - (Average Daily Usage x Average Lead Time)
This calculation gives a data-driven buffer that shields a business from unpredictable supply chain delays or sudden surges in consumer buying.
4. Computing the reorder level
The three inputs are combined to find the reorder level. By adding this calculated safety buffer directly to expected lead-time demand, a business identifies an appropriate unit threshold intended to trigger the next purchase order.
5. Monitoring stock against the reorder level
Current stock and inventory positions, including open orders, are typically tracked on an ongoing basis. Once the calculated reorder threshold is reached, a purchase order is raised, provided no duplicate replenishment orders are already in transit.
6. Reviewing and revising the reorder level
As usage rates and supplier lead times change with seasonality, market demand or supplier performance, the reorder level is reviewed periodically to maintain optimal inventory levels.
Example
A retailer stocks a fast-selling accessory item and wants to set its reorder level.
|
Metric |
Value |
|
Average daily usage |
50 units |
|
Maximum daily usage |
70 units |
|
Average lead time |
6 days |
|
Maximum lead time |
9 days |
|
Cost per unit |
₹250 |
Safety Stock = (70 × 9) − (50 × 6) = 630 − 300 = 330 units
Reorder Level = 50 × 6 + 330 = 300 + 330 = 630 units
The retailer places a purchase order when stock falls to 630 units. At ₹250 per unit, this leaves ₹1,57,500 of inventory to meet demand during the supplier's lead time and absorb unexpected demand spikes.
Key points to remember
- Reorder level marks the stock quantity at which a fresh purchase order needs to be placed.
- It depends on average daily usage, supplier lead time and safety stock held as a buffer.
- A reorder level set too low risks stockouts, while one set too high ties up working capital.
- Usage rates and lead times can change over time, so the reorder level benefits from periodic review.
Manage your business with confidence.
Get started with a free trial of TallyPrime and explore its powerful business management capabilities.
Try TallyPrime free →FAQs
No. The reorder level only indicates when to place an order. The order quantity is determined separately, often using a fixed quantity or an Economic Order Quantity (EOQ) calculation.
No. The reorder level is typically used as the point for placing a new order, while the minimum stock level acts as a buffer until the new stock is received.
Yes. Raw material reorder levels depend on production schedules and supplier lead times, while finished goods reorder levels depend on sales patterns and customer demand.
Yes. The same item may have different usage rates and supplier lead times across locations, so businesses often maintain separate reorder levels for each warehouse or site.
