How to Add a Round Off Price Functionality in WooCommerce Checkout.

Code to Enable Round Off Price

Add the following code to your theme’s functions.php file or inside a custom plugin:

[code_panel]

// Round Off option on checkout
add_action( ‘woocommerce_review_order_before_payment’, ‘cb_checkout_donation_choice’ );

function cb_checkout_donation_choice() {

$chosen = WC()->session->get( ‘donation_chosen’ );

if ( empty( $chosen ) ) {
$chosen = WC()->checkout->get_value( ‘donation_choice’ );
}

if ( empty( $chosen ) ) {
$chosen = ‘0’;
}

$args = array(
‘type’ => ‘radio’,
‘class’ => array( ‘form-row-wide’, ‘update_totals_on_change’ ),
‘options’ => array(
‘1’ => ‘Yes. Round up my Total.’,
‘0’ => ‘No. Thank you.’,
),
‘default’ => $chosen,
);

echo ‘<div class=”round-off-box”>’;
echo ‘<h3>Round off the product price.</h3>’;

woocommerce_form_field(
‘donation_choice’,
$args,
$chosen
);

echo ‘</div>’;
}

// Add Round Off fee to cart
add_action( ‘woocommerce_cart_calculate_fees’, ‘cb_checkout_donation_choice_fee’, 20, 1 );

function cb_checkout_donation_choice_fee( $cart ) {

// Don’t run in WooCommerce admin unless it’s an AJAX request
if ( is_admin() && ! defined( ‘DOING_AJAX’ ) ) {
return;
}

if ( ! WC()->session ) {
return;
}

$radio = WC()->session->get( ‘donation_chosen’ );

// Only add the fee when “Yes” is selected
if ( $radio !== ‘1’ ) {
return;
}

// Get current cart total
$total = $cart->get_cart_contents_total();

// Add shipping cost
$total += $cart->get_shipping_total();

// Round up to the next whole number
$rounded_up_amount = ceil( $total );

// Calculate round-off amount
$fee = $rounded_up_amount – $total;

// If already a whole number, add 1
if ( $fee <= 0 ) {
$fee = 1;
}

// Add Round Off fee
$cart->add_fee(
‘Round Off’,
$fee,
false
);
}

// Save Round Off choice to WooCommerce session
add_action(
‘woocommerce_checkout_update_order_review’,
‘cb_checkout_donation_choice_set_session’
);

function cb_checkout_donation_choice_set_session( $posted_data ) {

parse_str( $posted_data, $output );

if ( isset( $output[‘donation_choice’] ) ) {
WC()->session->set(
‘donation_chosen’,
sanitize_text_field( $output[‘donation_choice’] )
);
}
}

[/code_panel]

How This Works

  1. Option at Checkout
    A radio button is displayed asking the customer whether they want to round up their total.

  2. Calculation of Round Off Amount
    If the customer selects “Yes,” WooCommerce calculates the difference between the current total and the next whole number.

    Example:

    • Order Total = ₹784.20

    • Rounded Total = ₹785.00

    • Extra Fee = ₹0.80

  3. Add Fee Automatically
    The calculated difference is added as a fee called Round Off (you can rename this label).

  4. Saved in Session
    The customer’s choice is stored in session and applied dynamically.

Final Result

  • On the checkout page, customers will see an option:
     Yes. Round up my total.
     No. Thank you.

  • If they choose Yes, the cart total will round up and display a new fee.

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