Change number of decimals in Woocommerce cart totals

Question

In Woocommerce, I\'ve set the number of decimal to 7 on in Woocommerce general settings, so I can display the product price like this $0.0453321

Answer 1

The correct way is to change just the number of allowed decimals for cart and checkout pages only:

add_filter( 'wc_get_price_decimals', 'change_prices_decimals', 20, 1 );
function change_prices_decimals( $decimals ){
    if( is_cart() || is_checkout() )
        $decimals = 2;
    return $decimals;
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

---

To set the dispayed cart gran total with 2 decimals use this instead (for Woocommerce 3.3+ only):

add_filter( 'woocommerce_cart_tax_totals', 'change_decimals_cart_tax_totals', 20, 2 );
function change_decimals_cart_tax_totals( $tax_totals, $cart ){
    $decimals = array('decimals' => 2);

    $taxes      = $cart->get_taxes();
    $tax_totals = array();

    foreach ( $taxes as $key => $tax ) {
        $code = WC_Tax::get_rate_code( $key );

        if ( $code || $key === apply_filters( 'woocommerce_cart_remove_taxes_zero_rate_id', 'zero-rated' ) ) {
            if ( ! isset( $tax_totals[ $code ] ) ) {
                $tax_totals[ $code ] = new stdClass();
                $tax_totals[ $code ]->amount = 0;
            }
            $tax_totals[ $code ]->tax_rate_id       = $key;
            $tax_totals[ $code ]->is_compound       = WC_Tax::is_compound( $key );
            $tax_totals[ $code ]->label             = WC_Tax::get_rate_label( $key );
            $tax_totals[ $code ]->amount           += wc_round_tax_total( $tax );
            $tax_totals[ $code ]->formatted_amount  = wc_price( wc_round_tax_total( $tax_totals[ $code ]->amount ), $decimals );
        }
    }

    if ( apply_filters( 'woocommerce_cart_hide_zero_taxes', true ) ) {
        $amounts    = array_filter( wp_list_pluck( $tax_totals, 'amount' ) );
        $tax_totals = array_intersect_key( $tax_totals, $amounts );
    }
    return $tax_totals;
}

add_filter( 'woocommerce_cart_totals_order_total_html', 'change_decimals_cart_totals_order_total_html', 20, 1 );
function change_decimals_cart_totals_order_total_html( $formatted_price ){
    $decimals = array('decimals' => 2);

    $value = '<strong>' . wc_price( WC()->cart->get_total('edit'), $decimals ) . '</strong> ';

    // If prices are tax inclusive, show taxes here.
    if ( wc_tax_enabled() && WC()->cart->display_prices_including_tax() ) {
        $tax_string_array = array();
        $cart_tax_totals  = WC()->cart->get_tax_totals();

        if ( get_option( 'woocommerce_tax_total_display' ) == 'itemized' ) {
            foreach ( $cart_tax_totals as $code => $tax ) {
                $tax_string_array[] = sprintf( '%s %s', $tax->formatted_amount, $tax->label );
            }
        } elseif ( ! empty( $cart_tax_totals ) ) {
            $tax_string_array[] = sprintf( '%s %s', wc_price( WC()->cart->get_taxes_total( true, true ), $decimals ), WC()->countries->tax_or_vat() );
        }

        if ( ! empty( $tax_string_array ) ) {
            $taxable_address = WC()->customer->get_taxable_address();
            $estimated_text  = WC()->customer->is_customer_outside_base() && ! WC()->customer->has_calculated_shipping()
                ? sprintf( ' ' . __( 'estimated for %s', 'woocommerce' ), WC()->countries->estimated_for_prefix( $taxable_address[0] ) . WC()->countries->countries[ $taxable_address[0] ] )
                : '';
            $value .= '<small class="includes_tax">' . sprintf( __( '(includes %s)', 'woocommerce' ), implode( ', ', $tax_string_array ) . $estimated_text ) . '</small>';
        }
    }
    return $value;
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

You can't really round the prices in cart totals appart. If you do it with different hooks, you will get calculation errors. My code is just changing the number of decimals on displayed formatted prices and will not alter the calculations on real prices…

Related: Change number of decimals on Woocommerce displayed cart subtotal

Answer 2

If you want to change cart total only at cart and checkout page then you need to copy template in your theme

First copy 2 files from woocommerce plugin template to your theme .

1) Copy plugins\woocommerce\templates\cart\cart-totals.php to your-theme-folder\woocommerce\cart\cart-totals.php

2) Copy plugins\woocommerce\templates\checkout\review-order.php to your-theme-folder\woocommerce\checkout\review-order.php

And in both files find the wc_cart_totals_order_total_html() comment this code and put below code instead.

  $args=array('decimals'=> 2);
  echo  wc_price(WC()->cart->total,$args); 

This code is tested and its working fine.Hope it will help you as well.

Answer 3

In my case I needed to keep 3 decimal places "visible" throughout the site but approximate only the grand total to 2 decimal places (with a zero for the third decimal place) because my payment gateway accepted only 2 significant digits after the decimal.

Prices displayed as: 0.336
Taxes: 0.017
But grand total needed to be: 0.350 (instead of 0.353)

I ended up not using the code because it was so horrific but you can say it was a mental excercise:

add_filter( 'wc_get_price_decimals', 'change_prices_decimals', 20, 1 );
function change_prices_decimals( $decimals ){

    if( is_cart() || is_checkout() )
    {
        $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS,0);
        $length = count($trace);
        for ($i = 0; $i < $length; $i++)
        {
            if($trace[$i]["function"] == "set_total"){
                $decimals = 2;
                return $decimals;
            }
        }
    }

    return $decimals;
}