How Does Replenishment Planning Work?

Quick Answer: Replenishment planning uses your demand forecast, current inventory levels, supplier lead times, and safety stock targets to calculate when and how much to reorder for each SKU. The output is a set of prioritized purchase order recommendations that prevent stockouts while avoiding unnecessary overstock.

Replenishment planning is the process of determining when to reorder inventory and in what quantities — for every SKU, across every supplier — based on expected future demand and current stock coverage. It connects the demand forecast to the purchase order.

Without a structured replenishment process, buying decisions default to gut feel, tribal knowledge, or reactive firefighting when stockouts occur. Replenishment planning replaces this with a systematic, data-driven approach that runs on a defined cadence.

How Replenishment Planning Works Step by Step

1

Start with a Demand Forecast

Replenishment planning begins with a reliable forecast. The forecast tells you how many units of each SKU you expect to sell over your planning horizon — typically 4 to 26 weeks, depending on your lead times and planning cadence.

2

Assess Current Inventory Coverage

For each SKU, compare current on-hand inventory against the forecast demand. This gives you weeks or months of coverage — how long your current stock will last at the forecasted rate of sale.

Items where coverage falls below a threshold — your reorder point — are candidates for replenishment. When projected sales exceed available inventory, you'll see the inventory balance reset to zero, signaling a stockout that needs to be addressed.

3

Apply Supplier Constraints

Replenishment planning incorporates:

• Lead time — How many weeks until an order arrives

• Minimum order quantities (MOQs) — The smallest order a supplier accepts

• Order frequency — How often you can place orders with a given supplier

• Case packs — Whether orders must be placed in multiples of a defined quantity

4

Calculate Recommended Order Quantities

The system calculates how much to order based on:

Order Quantity = Demand During Lead Time + Safety Stock − Projected Inventory at Reorder Point

The output is a per-SKU quantity that covers demand through the next coverage period while maintaining your safety stock buffer.

5

Review, Adjust, and Approve

Planning teams review the recommendations, apply any manual overrides, and approve the orders that align with budget and supplier constraints. Approved orders become purchase orders.

Key Inputs for Replenishment Planning

Input	Why It Matters
Demand forecast	Tells the system what future demand to plan for
On-hand inventory	Starting point for coverage calculations
On-order inventory	Prevents double-ordering for already-placed POs
Lead time (by supplier)	Determines when to trigger the reorder
Safety stock	Buffer against forecast error and supply variability
MOQ / order multiples	Ensures orders meet supplier minimums
Coverage period	How many weeks of supply to target

Replenishment Triggers: Reorder Point vs. Periodic Review

Reorder Point (Continuous Review)

An order is triggered whenever inventory falls below a pre-defined reorder point. Best for:

• Fast-moving SKUs where stockout risk is high

• Businesses with real-time inventory visibility

• Products with consistent, predictable demand

Periodic Review

How Moselle Automates Replenishment Planning

In Moselle, replenishment planning is done through Production Plans. You create a production plan against an active forecast, set your coverage period and constraints, and Moselle generates a prioritized list of SKUs that need replenishment — along with recommended order quantities.

From there, you can generate purchase orders directly in Moselle or export the plan to send to suppliers.

https://github.com/Moselle-io/moselle-docs/blob/master/faq/planning-and-execution/replenishment/create-a-production-plan.mdhttps://github.com/Moselle-io/moselle-docs/blob/master/faq/planning-and-execution/replenishment/generate-orders.md

Frequently Asked Questions

How often should I run a replenishment plan?

Answer: Most brands run replenishment plans weekly or biweekly. The right cadence depends on your lead times — if you have a 90-day lead time, weekly runs don't add much value over monthly. If you have 2-week lead times, weekly planning keeps you ahead of stockouts.

What's the difference between a reorder point and safety stock?

Answer: The reorder point is the inventory level that triggers an order. Safety stock is the buffer built into that calculation to absorb demand variability and lead time uncertainty. Safety stock is a component of your reorder point.

Can replenishment planning work across multiple suppliers?

Answer: Yes. Moselle lets you assign SKUs to suppliers with individual lead times, MOQs, and order frequency settings — and generates separate purchase orders per supplier.