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.

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🔹 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.

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🔒 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.