How to Set WooCommerce BOGO (Buy One Get One) Discount Only For Specific Number of Products in the Cart?

By setting a product limit for BOGO discounts, store owners can aim to increase the average order value. This code implements a “Buy One, Get One 50% Off” promotion for specific products in the WooCommerce cart, limiting the discount to a predefined quantity per product.

add_action('woocommerce_cart_calculate_fees', 'ts_bogo_fifty_percent_off', 10, 1);

function ts_bogo_fifty_percent_off($cart) {
    if (is_admin() && !defined('DOING_AJAX')) {
        return;
    }

    $target_products = array(100, 456, 470); // Replace with your product IDs
    $product_limit = 2; // Set your product limit here
    $discount = 0;

    foreach ($cart->get_cart() as $cart_item) {
        if (in_array($cart_item['product_id'], $target_products)) {
            $qty = min($cart_item['quantity'], $product_limit);
            $product_limit -= $qty;
            $discount -= $qty * ($cart_item['data']->get_price() * 0.5);
            if ($product_limit <= 0) {
                break;
            }
        }
    }

    if ($discount < 0) {
        $cart->add_fee(__('BOGO 50% Off Discount'), $discount);
    }
}

Output

If you add ‘N’ items to your cart, you can make sure that ‘Buy One Get One’ discounts only apply to certain products, and you can set a limit on how many items get the discount. In the example below, the discount is applied to only two items, as set in the code.

Similarly, you can also add a free gift based on the selected quantity in WooCommerce.