---
title: How to Set a Fixed (Allowed) Quantity for a Product
description: Let WooCommerce customers buy only exact quantities you allow, such as 3, 7 or 9, or block specific amounts, with Fixed Quantity.
url: "https://wpfactory.com/docs/fixed-product-quantity/"
updated: "2026-09-26"
category: How to
tags:
  - Min Max Default Quantity for WooCommerce
---

# How to Set a Fixed (Allowed) Quantity for a Product

To set a fixed quantity in WooCommerce, so customers can only buy exact amounts such as 3, 7 or 9, tick **Allowed quantity** at **WPFactory > Quantity Manager > Fixed Quantity** in [Min Max Step Quantity Limits Manager for WooCommerce](https://wpfactory.com/item/product-quantity-for-woocommerce/) and enter a comma-separated list. You can also block specific amounts. The all-products lists are free.

![Product Quantity settings in WooCommerce](https://wpfactory.com/wp-content/uploads/pasted-image-0-39.png)

## Step by step

1. Go to **WPFactory > Quantity Manager** (also reachable at **WooCommerce > Settings > Product Quantity**).
2. Open the **Fixed Quantity** section.
3. Tick **Allowed quantity** to enable the section.
4. In **All products**, enter the allowed quantities as a comma-separated list, for example `3,7,9`.
5. To block amounts instead, tick **Disallowed quantity** and list the amounts to refuse, for example `13`.
6. Click **Save changes**.

![Allowed Quantity Options in the Fixed Quantity section](https://wpfactory.com/wp-content/uploads/pasted-image-0-1-5.png)

## How the lists behave

- **Allowed:** only the values you list are accepted. An empty field is ignored.
- **Disallowed:** every value except the ones you list is accepted.
- Fixed quantities override minimum, maximum and step values for the products they apply to.
- The check uses the product's total quantity in the cart, so two separate adds of 3 count as 6.
- **Ranges:** write `[10-100|10]` to allow 10, 20, 30 up to 100 without typing each value. You can mix ranges and single values, for example `1,[10-50|10]`.

## Options reference

| Label | Option ID | Default | Free/Pro |
| --- | --- | --- | --- |
| Allowed quantity (enable) | `wpfmmsq_exact_qty_allowed_section_enabled` | No | Free |
| Allowed quantity: All products | `wpfmmsq_exact_qty_allowed` | (empty) | Free |
| Allowed quantity: Per product | `wpfmmsq_exact_qty_allowed_per_product_enabled` | No | Pro |
| Allowed quantity: Per Category | `wpfmmsq_exact_qty_allowed_per_cat_item_quantity_per_product` | No | Pro |
| Allowed quantity: Per Attribute | `wpfmmsq_exact_qty_allowed_per_attribute_item_quantity` | No | Pro |
| Permit the calculation of subset sums from the allowed quantities | `wpfmmsq_exact_subset_sum_allowed_enabled` | No | Pro |
| Disallowed quantity (enable) | `wpfmmsq_exact_qty_disallowed_section_enabled` | No | Free |
| Disallowed quantity: All products | `wpfmmsq_exact_qty_disallowed` | (empty) | Free |
| Disallowed quantity: Per product | `wpfmmsq_exact_qty_disallowed_per_product_enabled` | No | Pro |
| Cart fixed quantity | `wpfmmsq_exact_cart_total_quantity_enabled` | No | Pro |

**Note:** the **Message** field controls what shoppers see when they enter a quantity you do not allow. It accepts the placeholders `%product_title%`, `%allowed_quantity%` and `%quantity%`.

## Common variations

- **Per product (Pro):** tick Per product, then fill **Exact quantity allowed** or **Exact quantity disallowed** in the product's **Product Quantity** box. Leave it blank to use the global list.
- **Per category (Pro):** the category page gets **Exact quantity allowed for all product** (each product) and **Exact quantity allowed (grouped for this category)** (the category's combined quantity).
- **Combinations (Pro):** with subset sums on, totals made by adding allowed values are accepted too. Allowing `5,10` then also accepts 15.
- **Whole cart (Pro):** **Cart fixed quantity** with a **Cart total quantity** such as `6,12` makes the entire cart match one of those totals.

## What the customer sees

Pair the list with the [Quantity Dropdown](https://wpfactory.com/docs/dropdown-quantity-plugin/) so customers pick from the allowed values only; disallowed values are left out of the dropdown. To open the page at the smallest allowed value, set **General > Initial Quantity Options > Single product page** to **Change to lowest fixed quantity**. If a wrong quantity reaches checkout, the order is stopped with your Message. With **General > "Add to cart" validation** set to auto-correct, an allowed-list quantity changes to the closest allowed value, and a disallowed one moves up to the next accepted value.

## If it does not work

- **Any quantity is accepted:** the section checkbox (Allowed quantity or Disallowed quantity) is not ticked.
- **The number box still counts 1, 2, 3:** expected with the standard box. Use the dropdown to show only allowed values.
- **A range is ignored:** check the format, square brackets with a hyphen and a pipe: `[from-to|step]`.

## FAQ

### What is the difference between a fixed quantity and a step?

A step accepts every multiple (6, 12, 18 and so on). A fixed list accepts only the values you name, which suits pack sizes that do not follow a pattern.

### Can a customer buy 6 if I allow 3?

Not by default, because 6 is not in the list. Add 6 to the list, or enable subset sums in Pro to accept combinations of different allowed values.

### Can I set fixed quantities for one product only?

Yes, with Pro's Per product option. The free version applies one list to all products.

### Get more control

The all-products fixed quantity is free. [Min Max Step Quantity Limits Manager for WooCommerce](https://wpfactory.com/item/product-quantity-for-woocommerce/) Pro adds per-product, per-category and per-attribute allowed quantities, plus subset-sum matching. [See what Pro unlocks](https://wpfactory.com/item/product-quantity-for-woocommerce/).

Need a hand? Our team answers every ticket on the [Quantity Manager support forum](https://wpfactory.com/support/item/product-quantity-for-woocommerce/).

Related articles

- [How to Sell Products in Multiples with a Quantity Step](https://wpfactory.com/docs/woocommerce-quantity-step-increment/)
- [How to Show Quantity Columns in the Products List](https://wpfactory.com/docs/woocommerce-admin-quantity-columns/)
- [How to Display Quantity Information on Product and Shop Pages](https://wpfactory.com/docs/minimum-quantity-display/)
- [How to Set a Default Quantity on Product Page Load](https://wpfactory.com/docs/default-quantity-onload/)
- [How to Sell Products Individually without Quantity Options](https://wpfactory.com/docs/individual-product-sale/)

 

[![Min Max Default Quantity for WooCommerce](https://wpfactory.com/wp-content/uploads/Min-Max-Default-Quantity-for-WooCommerce.webp)](https://wpfactory.com/item/product-quantity-for-woocommerce/)