Product Quantity Rules

Product quantity rules let you control exactly how many units a customer can buy. You can set a minimum (they must buy at least X), a maximum (they can buy at most X), or a step increment (they buy in multiples of X).

Creating a Rule

• Go to Rules and click Create rule
• Choose the products or variants you want the rule to apply to
• Set your limits:
  • Minimum quantity – The smallest amount a customer can add to cart. Useful for wholesale or bulk-only products.
  • Maximum quantity – The largest amount allowed per order. Useful for limited stock or fair-use policies.
  • Step / increment – Forces purchases in multiples (e.g., step of 6 means customers can buy 6, 12, 18, etc.). Great for products sold by the case or pack.
• Save the rule

You can combine all three settings on the same rule. For example, minimum 2, maximum 20, step 2 means customers can buy 2, 4, 6, 8… up to 20.

What the Customer Sees

• The quantity selector on the product page adjusts automatically – the +/- buttons skip to valid amounts
• If a customer tries to enter an invalid quantity, they see an inline message explaining the limit
• At checkout, Shopify validates the quantity again so limits cannot be bypassed

Plan

Available on all plans including Free (up to 5 rules). Growth and Advanced plans support unlimited rules.