# How Quantity Increment Calculation and Quantity Limit Work

The **Quantity Increment (QI)** function is a powerful tool to **promote bulk sales** and **control inventory effectively**. However, many merchants aren’t fully aware of how the rules operate — leading to missed opportunities to optimize store performance.

This article provides a detailed explanation of **Quantity Increment Calculation** and **Quantity Limit**, helping you apply them correctly to your Shopify store.

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### ⚙️ **Setting Up Quantity Increment Rules**

In the **Quantity Increment Calculation** section, you can select one of three rule types:

* **Variant Quantity**
* **Product Quantity**
* **Order Quantity**

Let’s explore each with examples below 👇

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### 🔹 **Variant Quantity**

Your customers must purchase a **variant** in multiples of the set quantity.

**Example:**\
You set the Quantity Increment to **5** for products in the **Necklace** collection.

* Product A has 2 variants: **Black** and **White**.
* Customers must buy **5x Black A** and/or **5x White A** to check out.

🛒 *On Cart Page:*\
Each variant must meet the increment requirement separately.

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### 🔹 **Product Quantity**

Your customers must buy a **product’s total quantity** (regardless of variant) in multiples of the increment number.

**Example:**

* The Quantity Increment is **5** for the Necklace collection.
* Product A’s total quantity (across all variants) must be **5, 10, 15…** etc.

🛒 *On Cart Page:*\
The total item count of Product A must satisfy the rule — color or variant doesn’t matter.

***

### 🔹 **Order Quantity**

Your customers’ **total order quantity** must be a multiple of the increment number.

**Example:**

* The Quantity Increment is **5** for the Necklace collection.
* On checkout, Product A = 6 items and Product B = 4 items → Total **10**, which satisfies the rule.

🧾 *On Checkout Page:*\
The system checks the total number of qualified products in the order.

> 💡 If the cart includes both Necklace collection products and other items, the rule applies **only** to products from the **Necklace** collection.

**Example:**\
Rule: *Order Quantity – 5*

* Total order = 11 items
* Necklace collection = 10 items\
  ✅ The order satisfies the rule because 10 is a multiple of 5.

***

### 🔒 **Quantity Limit**

The **Quantity Limit** feature lets you define the **minimum** and **maximum** quantity that customers can order — at the variant, product, or order level.

**Example:**\
Rule: *Necklace Collection – Order Quantity – 5*

* Minimum: **15**
* Maximum: **30**

This means customers must buy **at least 15** but **no more than 30** items from the **Necklace** collection.

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#### **Scenario 1: Below Minimum**

* The total order quantity is **under 15** → ❌ **Checkout blocked**\
  🛒 *On Cart Page:*\
  Customers will see a notice requiring more items.

#### **Scenario 2: Total Satisfied**

* Even if each product’s quantity is below 15, as long as the **combined total** of Necklace products meets the rule, ✅ **checkout is allowed**.\
  🧾 *On Checkout Page:*\
  The order passes validation successfully.

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#### ✅ **In Summary**

* **Quantity Increment** → Controls purchase steps (multiples).
* **Quantity Limit** → Defines purchase boundaries (min/max).\
  Together, they give you precise control over **order sizes**, **inventory flow**, and **wholesale pricing strategy**.


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