Mostafa AHmadi Mostafa AHmadi - 1 year ago 121
PHP Question

WooCommerce - Adding Extra fee to Cart based on total items weight

I need to add charge on product total weight and show it in cart.

I mean in cart, when adding an item, i will set an extra charge.

This charge should be calculate like this:

$extra_charge = $total_cart_weight * 0.15;

If it's possible, How can I achieve this?


Answer Source

You can do it easily hooking this function to woocommerce_cart_calculate_fees hook, this way:

function weight_add_cart_fee() {

    // Set here your percentage
    $percentage = 0.15;

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )

    // Get weight of all items in the cart
    $cart_weight = WC()->cart->get_cart_contents_weight();

    // calculate the fee amount
    $fee = $cart_weight * $percentage;

    // If weight amount is not null, adds the fee calcualtion to cart
    if ( !empty( $cart_weight ) ) { 
        WC()->cart->add_fee( __('Extra charge (weight): ', 'your_theme_slug'), $fee, false );
add_action( 'woocommerce_cart_calculate_fees','weight_add_cart_fee' );

This code is tested and works. It goes on function.php file of your active child theme or theme.

For tax options: see add_fee() method tax options depending on your global tax settings.