---
title: "Automated Replenishment: How It Works in a Shopify Warehouse"
description: "Automated replenishment flags reorders before you run out and refills pick bins from overstock. The math, what stays manual, and how to set it up."
url: https://www.skusavvy.com/blog/automated-replenishment
lastUpdated: 2026-11-09
---

# Automated Replenishment: How It Works in a Shopify Warehouse

Automated replenishment means your inventory system watches each SKU against a minimum and a maximum, then tells you to refill before you run out instead of after. In a Shopify warehouse that refill happens in two places: from your suppliers into the building, and from overstock into the pick bins. Most guides only cover the first one.

We build SKUSavvy, a mobile warehouse management system for eCommerce sellers, so this guide is written from the floor. If you already use SKUSavvy, the setup steps live in our [stock replenishment levels guide](/docs/guides/warehouse/stock-replenishment).

## What Is Replenishment?

Replenishment is putting stock back where demand will pull it. For a brand that ships its own orders, that means two questions every week: what do we need to buy, and which pick bins need refilling from the back?

Doing it by hand usually looks like a spreadsheet of sales, a guess at lead time and a buyer who remembers which vendor is slow. For the plain-language basics, see [what replenishing stock means](/blog/replenishing-stock-meaning). This post is about taking the guessing out of it.

## What Does Auto Replenishment Mean?

Auto replenishment means the system does the watching. You set the rules once (a minimum, a maximum, a lead time) and the software flags the SKU the moment those rules say a refill is due.

The phrase also gets used for consumer subscriptions and prepaid accounts that top themselves up. That is a different thing. Here we mean inventory: stock in a warehouse that sells through Shopify, wholesale or both.

## The Two Replenishment Loops in a Warehouse

Supplier replenishment keeps the building stocked. Bin replenishment keeps the pick face stocked. They fail in different ways, so they need different rules.

| Loop | What triggers it | What it produces |
| --- | --- | --- |
| Supplier replenishment | Projected stock falls below the minimum before a new purchase order could arrive | A suggested purchase order quantity that refills to the maximum |
| Bin-to-bin replenishment | A pick bin drops below its minimum while the same SKU sits in an overstock or pallet bin | A transfer from the overstock bin into the pick bin |

Skip the first loop and you stock out. Skip the second and you have stock in the building, but the picker walks to an empty bin, marks the order short and somebody goes hunting for the pallet.

## How the Reorder Math Works

Good automated replenishment does not wait for today's on-hand to hit the minimum. It looks ahead to the day a new order would actually land:

1. Start with on-hand stock.
2. Subtract committed stock (units already promised to open orders).
3. Add incoming stock from open purchase orders or transfers.
4. Subtract expected sales over the vendor's lead time.
5. If the result is below the minimum, it is time to order, and the suggested quantity refills back up to the maximum, rounded up to the vendor's order step.

Example numbers: a SKU sells 12 units a day and the vendor takes 10 days. You have 200 on hand, 30 committed and nothing incoming. On arrival day you would be at 200 − 30 − 120 = 50. With a minimum of 60, that SKU is due now. Refilling to a maximum of 300 means 250 units, which rounds up to 264 if the vendor sells in cases of 24.

Notice that today's on-hand of 200 looks healthy. That is exactly the SKU a manual weekly check misses.

## Automated vs Manual Replenishment

Manual replenishment works when you have a few dozen SKUs and one person who knows them all. It breaks when the catalog grows, when that person is out, or when one vendor's lead time quietly stretches from two weeks to five.

Automated replenishment gives you the same answer every day, for every SKU, from the same inputs. The buyer stops building the list and starts reviewing it.

## What Should Stay Manual

Automating the watching does not mean automating the spending. A few calls still belong to a person:

- Submitting the purchase order. The system should suggest quantities; someone approves the money.
- Thin-history SKUs. A new product with three weeks of sales does not have a reliable rate yet. Treat its suggestion as a starting point.
- Planned spikes. A promotion next month is not in last quarter's sales. Raise the maximum before the promo, not after it sells out.
- Vendor problems. If a supplier is on allocation, the math will keep asking for stock you cannot get.

## How to Set It Up in SKUSavvy

![SKUSavvy Bin Replenishment list showing from-bin, to-bin, current quantity and min-max range for each pick face](https://res.cloudinary.com/deoyetsee/image/upload/v1794265488/2026c75567e19a19e139eb1a782a3b82.png)

In SKUSavvy, replenishment lives in the same place as your bins and [purchase orders](/purchase-order-management), so the suggestion and the receiving happen in one system.

1. Get starting par levels. Suggested Par Levels computes a minimum and maximum for each item that is selling, from its recent sales rate, how often it has been in stock and its lead time. Accept the ones that look right.
2. Or set them by hand. Open an inventory item, turn on Automated Replenishment, and set the minimum, the maximum and a default lead time.
3. Watch Reorder Radar. Reorder Radar only watches items that already have a minimum and maximum set. Those projected to drop below their minimum before a new order could arrive show up grouped by vendor, most urgent first.
4. Start the PO. Start PO opens a new purchase order for that vendor, pre-filled with the suggested quantities. Nothing is ordered until you review and submit it.
5. Turn on bin replenishment. In company settings under Inventory, enable bin-to-bin replenishments, set a minimum and maximum for the pick bin, and work the list from Inventory, Bin Replenishments, scanning the bin you move stock into.

Lead times get more accurate as you receive purchase orders in SKUSavvy, so the suggestions tighten the longer you use it.

## Features and Benefits

How SKUSavvy handles automated replenishment for Shopify sellers:

| Feature | Benefit on the floor |
| --- | --- |
| Suggested Par Levels | A starting minimum and maximum from real sales history, without a spreadsheet |
| Reorder Radar | See which vendors need a purchase order before you run out, not after |
| Start PO with suggested quantities | One click from the alert to a draft purchase order you review and submit |
| Lead times learned from purchase order history | Reorder timing follows how your vendors actually ship |
| Lead time override | Test a faster or slower shipping lane without changing saved vendor lead times |
| Bin-to-bin replenishment | Pick bins get refilled from overstock before a picker finds them empty |
| Kept in sync with your Shopify store | Shopify receives available stock quantities from SKUSavvy |

## Using Savvy Bot With Replenishment

The reorder math itself is not AI. Suggested Par Levels and Reorder Radar use your sales rate, in-stock history and lead times, and you can expand a suggestion to see exactly what it is based on.

Savvy Bot is SKUSavvy's AI assistant. It can pull live account context and draft reports, so a buyer can ask what is running low or what sold last week without exporting spreadsheets first. Edits stay off unless you turn them on and approve them, and answers use AI credits. The buyer still decides what to order.

## FAQ

## Automated Replenishment FAQ

### What Is Replenishment?

Putting stock back where demand will pull it: buying from suppliers to refill the warehouse, and moving stock from overstock into pick bins.

### What Does Auto Replenishment Mean?

The system watches each SKU against a minimum, maximum and lead time and flags a refill when those rules say it is due, instead of someone checking a spreadsheet.

### What Are Automated Supply Replenishment Systems?

Software that projects stock forward over the vendor lead time and suggests what to order and how much. In SKUSavvy that is Reorder Radar plus suggested purchase order quantities.

### What Is an Automated Inventory Management System?

A system that tracks stock by location as it is received, moved, picked and shipped, and uses that data for counts and replenishment without manual re-entry.

### Does SKUSavvy Place Purchase Orders Automatically?

No. SKUSavvy suggests quantities and can pre-fill a purchase order, but nothing is ordered until you review and submit it.

## Keep Reading

#### Stock Replenishment Levels

Set par values, view stock ranges and run bin replenishments in SKUSavvy.

[Read the guide](https://www.skusavvy.com/docs/guides/warehouse/stock-replenishment)

#### Replenishing Stock Meaning

The plain-language basics of replenishing stock, with examples.

[Read the explainer](https://www.skusavvy.com/blog/replenishing-stock-meaning)

#### Purchase Order Management

Create, send and receive purchase orders kept in sync with your Shopify store.

[See purchase orders](https://www.skusavvy.com/purchase-order-management)

## Set Your Par Levels Once and Let the Radar Watch Them

Start a 30-day trial or check pricing for your order volume.