# Sell a product only in multiples (quantity step) in WooCommerce

> Make the quantity field go up in steps, e.g. 6, 12, 18, for products sold by the case.

- Source: https://plugstack.dev/snippets/woocommerce-quantity-step/
- Published by: PlugStack
- Last updated: 2026-09-24

```php
add_filter( 'woocommerce_quantity_input_args', function ( $args, $product ) {
	$step = 6; // Units per case.
	$args['step']        = $step;
	$args['min_value']   = $step;
	$args['input_value'] = max( $step, (int) $args['input_value'] );
	return $args;
}, 10, 2 );
```