# Sell in Packs (Quantity Steps)

> Makes products sell only in multiples, such as packs of 6, by setting the quantity step and checking the cart.

- Type: PHP
- Runs: Run everywhere
- Category: [WooCommerce](https://wpide.com/library/category/woocommerce/)
- Requires: WooCommerce
- Tags: woocommerce, quantity, packs, wholesale
- Author: WPIDE Team
- Installs: 0
- Updated: 2026-10-28
- Page: https://wpide.com/library/woo-quantity-step/

## Code

```php
$wpide_qty_step = 6; // Products can only be bought in multiples of this number.

add_filter( 'woocommerce_quantity_input_args', function ( $args, $product ) use ( $wpide_qty_step ) {
    if ( $product->is_sold_individually() ) {
        return $args;
    }

    $args['step']      = $wpide_qty_step;
    $args['min_value'] = max( $wpide_qty_step, (int) $args['min_value'] );

    if ( (int) $args['input_value'] < $wpide_qty_step ) {
        $args['input_value'] = $wpide_qty_step;
    }

    return $args;
}, 10, 2 );

add_filter( 'woocommerce_add_to_cart_validation', function ( $passed, $product_id, $quantity ) use ( $wpide_qty_step ) {
    if ( $quantity % $wpide_qty_step ) {
        wc_add_notice( sprintf( 'This product is sold in packs of %d.', $wpide_qty_step ), 'error' );
        return false;
    }

    return $passed;
}, 10, 3 );

add_action( 'woocommerce_check_cart_items', function () use ( $wpide_qty_step ) {
    foreach ( WC()->cart->get_cart() as $item ) {
        if ( ! $item['data']->is_sold_individually() && $item['quantity'] % $wpide_qty_step ) {
            wc_add_notice( sprintf( '"%1$s" is sold in packs of %2$d. Please adjust the quantity.', $item['data']->get_name(), $wpide_qty_step ), 'error' );
        }
    }
} );
```

## Notes

Change $step. The minimum quantity becomes one pack.

## How to use it

Install the free WPIDE plugin (https://wordpress.org/plugins/wpide/), find "Sell in Packs (Quantity Steps)" in its snippet library and add it in one click; or create a new PHP snippet in WPIDE (or any code snippets plugin) and paste the code above. More snippets: https://wpide.com/library/