Replenishment
What is warehouse replenishment?
Warehouse replenishment (or inventory replenishment) is the process of moving inventory from bulk storage locations to primary picking areas to maintain stock availability for order fulfillment.
Replenishment strategies and planning
Robust replenishment planning ensures sufficient items remain accessible for efficient picking, reducing the risk of order delays. Here are some frequently used warehouse replenishment strategies.
Min-max replenishment
Min-max replenishment occurs when pick location quantities fall below minimum thresholds, directing operatives to replenish up to maximum capacity levels.
The warehouse management system (WMS) calculates appropriate min-max values based on product velocity, pick location size and lead time, balancing stock availability against the space constraints of forward pick areas.
Demand-based replenishment
Demand-based replenishment analyzes order forecasts and current pick location inventory to proactively move stock before depletion occurs.
The WMS evaluates upcoming orders, calculates consumption rates and generates replenishment tasks timed to complete before pick locations run empty.
Top-off replenishment
Top-off replenishment fills pick locations during periods of low order activity, such as overnight shifts or between peak order waves.
The WMS identifies quiet periods, assigning tasks to operatives during downtime to ensure optimal efficiency.
Task interleaving
Task interleaving combines replenishment with other warehouse activities (like picking and putaways) to maximize labor efficiency.
The WMS provides replenishment instructions that utilize travel time productively, meaning there’s no need for dedicated replenishment operatives.
Automated replenishment and WMS
A WMS can automatically prioritize replenishment tasks based on:
Urgency
Upcoming order requirements
Pick location depletion rates. High-priority replenishments for fast-moving items facing imminent stockouts take precedence over routine top-off tasks
A WMS also provides stock replenishment performance metrics including:
Replenishment task completion times
Pick location stockout frequency
Labor hours consumed by replenishment relative to total warehouse operations
These indicators help balance pick location sizes, adjust min-max thresholds and optimize replenishment timing to maintain availability, while controlling labor costs.