How to Set Up a Buy 2 Get 1 Free Offer in WooCommerce Using Custom Code

Running a Buy 2 Get 1 Free (BOGO) promotion is an excellent strategy to boost sales and encourage customers to purchase more products. While WooCommerce does not have a built-in feature for this type of offer, you can achieve it using custom PHP code.

Suggested Read: Partial COD (Cash on Delivery) in WooCommerce

Why Add a Buy 2 Get 1 Free [BOGO] Offer?

BOGO deals can:

• ✅ Increase average order value
• ✅ Encourage customers to buy more items
• ✅ Help clear old stock
• ✅ Enhance customer satisfaction

As you know that, WooCommerce does not provide a built-in method to apply BOGO offers. So, we will use custom PHP code to implement it.

Recommended: How to Add Extra Fees in WooCommerce (Without a Plugin)

Step 1: Understanding the BOGO Offer Mechanism

Our approach will:

• Check if the cart contains at least 3 products (quantity-based, not just different items).
• Find the cheapest product in the cart.
• Apply a discount equal to the price of the lowest item.
• Ensure the discount is visible at checkout.

Also Read: Check Pincode / Zipcode Code for WooCommerce Shipping Availability

Step 2: Add Custom PHP Code in functions.php

To apply the Buy 2 Get 1 Free discount, add the following PHP code to your theme’s functions.php file:

add_action('woocommerce_cart_calculate_fees', 'woobooster_apply_buy_2_get_1_free_discount');
function woobooster_apply_buy_2_get_1_free_discount() {
    if (is_admin() && !defined('DOING_AJAX')) {
        return;
    }
    
    $cart = WC()->cart;
    $cart_items = $cart->get_cart();
    $total_quantity = 0;
    $prices = [];

    // Loop through cart items to count total quantity and store prices
    foreach ($cart_items as $cart_item_key => $cart_item) {
        $quantity = $cart_item['quantity'];
        $price = $cart_item['data']->get_price();
        
        $total_quantity += $quantity;

        for ($i = 0; $i < $quantity; $i++) {
            $prices[] = $price;
        }
    }

    // Apply discount only if there are at least 3 items in the cart
    if ($total_quantity >= 3) {
        asort($prices); // Sort prices in ascending order
        $lowest_price = reset($prices); // Get the lowest price
        
        if ($lowest_price > 0) {
            $cart->add_fee(__('Buy 2 Get 1 Free Discount', 'woocommerce'), -$lowest_price, true);
        }
    }
}

How This Code Works

• Counts total quantity of products in the cart (not just unique products).
• Finds the cheapest product in the cart.
• Applies a discount equal to the cheapest product’s price if 3 or more products are added.
• Automatically adjusts based on different product prices.

Step 3: Displaying a Message in the Cart

Since this discount is applied at checkout, you might want to inform customers before they complete their purchase. Add this snippet to show a message in the cart:

add_action('woocommerce_before_cart', function() {
    echo '<p style="color: green; font-weight: bold;">Buy 2 Get 1 Free offer applied at checkout!</p>';
});

Step 4: Exclude Certain Products from the Offer

If you want to exclude specific products, modify the loop like this:

$excluded_products = [123, 456]; // Replace with product IDs
if (in_array($cart_item['product_id'], $excluded_products)) {
    continue;
}

Conclusion

Adding a Buy 2 Get 1 Free offer in WooCommerce using custom code gives you full control over the discount structure without relying on plugins.

Thanks for reading 🙏, I hope you will get this code snippet helpful for your project.

This method helps you increase sales while keeping customers happy! 🎉

Would you like help customizing it further? Contact Us