diff --git a/src/PluginHelper.php b/src/PluginHelper.php
index 015a3b8646..1cd71fd982 100644
--- a/src/PluginHelper.php
+++ b/src/PluginHelper.php
@@ -198,4 +198,30 @@ protected function get_site_url(): string {
 	protected function strip_url_protocol( string $url ): string {
 		return preg_replace( '#^https?://#', '', untrailingslashit( $url ) );
 	}
+
+	/**
+	 * It tries to convert a string to a decimal number using the dot as the decimal separator.
+	 * This is useful with functions like is_numeric as it doesn't recognize commas as decimal separators or any thousands separator.
+	 * Note: Using wc_format_decimal with a dot as the decimal separator (WC -> Settings -> General) will strip out commas but won’t replace them with dots.
+	 * For example, wc_format_decimal('2,4') will return 24 instead of 2.4.
+	 *
+	 * @param string $numeric_string The number to convert.
+	 *
+	 * @return string The number as a standard decimal. 1.245,63 -> 1245.65
+	 */
+	protected function convert_to_standard_decimal( string $numeric_string ): string {
+		$locale = localeconv();
+
+		$separators = [ wc_get_price_decimal_separator(), wc_get_price_thousand_separator(), $locale['thousands_sep'], $locale['mon_thousands_sep'], $locale['decimal_point'], $locale['mon_decimal_point'], ',' ];
+
+		if ( wc_get_price_decimals() > 0 ) {
+			// Replace all posible separators with dots.
+			$numeric_string = str_replace( $separators, '.', $numeric_string );
+			// Leave only the last dot that is the decimal separator.
+			return (string) preg_replace( '/\.(?=.*\.)/', '', $numeric_string );
+		} else {
+			// If no decimals remove all separators.
+			return str_replace( $separators, '', $numeric_string );
+		}
+	}
 }
diff --git a/src/Shipping/ZoneMethodsParser.php b/src/Shipping/ZoneMethodsParser.php
index c7238c0ab1..d1a92e09fc 100644
--- a/src/Shipping/ZoneMethodsParser.php
+++ b/src/Shipping/ZoneMethodsParser.php
@@ -5,6 +5,7 @@
 
 use Automattic\WooCommerce\GoogleListingsAndAds\Infrastructure\Service;
 use Automattic\WooCommerce\GoogleListingsAndAds\Proxies\WC;
+use Automattic\WooCommerce\GoogleListingsAndAds\PluginHelper;
 use WC_Shipping_Method;
 use WC_Shipping_Zone;
 
@@ -19,6 +20,8 @@
  */
 class ZoneMethodsParser implements Service {
 
+	use PluginHelper;
+
 	public const METHOD_FLAT_RATE = 'flat_rate';
 	public const METHOD_FREE      = 'free_shipping';
 
@@ -123,7 +126,7 @@ protected function get_flat_rate_method_rate( object $method ): ?float {
 		$rate = null;
 
 		$flat_cost = 0;
-		$cost      = $method->get_option( 'cost' );
+		$cost      = $this->convert_to_standard_decimal( (string) $method->get_option( 'cost' ) );
 		// Check if the cost is a numeric value (and not null or a math expression).
 		if ( is_numeric( $cost ) ) {
 			$flat_cost = (float) $cost;
@@ -131,7 +134,7 @@ protected function get_flat_rate_method_rate( object $method ): ?float {
 		}
 
 		// Add the no class cost.
-		$no_class_cost = $method->get_option( 'no_class_cost' );
+		$no_class_cost = $this->convert_to_standard_decimal( (string) $method->get_option( 'no_class_cost' ) );
 		if ( is_numeric( $no_class_cost ) ) {
 			$rate = $flat_cost + (float) $no_class_cost;
 		}
@@ -155,7 +158,7 @@ protected function get_flat_rate_method_class_rates( object $method ): array {
 		$class_rates = [];
 
 		$flat_cost = 0;
-		$cost      = $method->get_option( 'cost' );
+		$cost      = $this->convert_to_standard_decimal( (string) $method->get_option( 'cost' ) );
 		// Check if the cost is a numeric value (and not null or a math expression).
 		if ( is_numeric( $cost ) ) {
 			$flat_cost = (float) $cost;
@@ -164,7 +167,7 @@ protected function get_flat_rate_method_class_rates( object $method ): array {
 		// Add shipping class costs.
 		$shipping_classes = $this->wc->get_shipping_classes();
 		foreach ( $shipping_classes as $shipping_class ) {
-			$shipping_class_cost = $method->get_option( 'class_cost_' . $shipping_class->term_id );
+			$shipping_class_cost = $this->convert_to_standard_decimal( (string) $method->get_option( 'class_cost_' . $shipping_class->term_id ) );
 			if ( is_numeric( $shipping_class_cost ) ) {
 				// Add the flat rate cost to the shipping class cost.
 				$class_rates[ $shipping_class->slug ] = [
diff --git a/tests/Unit/Plugin/PluginHelperTraitTest.php b/tests/Unit/Plugin/PluginHelperTraitTest.php
new file mode 100644
index 0000000000..d486e32ddf
--- /dev/null
+++ b/tests/Unit/Plugin/PluginHelperTraitTest.php
@@ -0,0 +1,73 @@
+<?php
+declare( strict_types=1 );
+
+namespace Automattic\WooCommerce\GoogleListingsAndAds\Tests\Unit\API\Site\Controllers;
+
+use PHPUnit\Framework\TestCase;
+use Automattic\WooCommerce\GoogleListingsAndAds\PluginHelper;
+
+
+/**
+ * Class PluginHelperTraitTest
+ *
+ * @package Automattic\WooCommerce\GoogleListingsAndAds\Tests\Unit\API\Site\Controllers
+ */
+class PluginHelperTraitTest extends TestCase {
+
+
+	/** @var PluginHelper $trait */
+	protected $trait;
+
+	/**
+	 * Runs before each test is executed.
+	 */
+	public function setUp(): void {
+		parent::setUp();
+
+		// phpcs:ignore Universal.Classes.RequireAnonClassParentheses.Missing
+		$this->trait = new class {
+			use PluginHelper {
+				convert_to_standard_decimal as public;
+			}
+		};
+	}
+
+
+	public function test_comma_decimals_gets_converted_to_dot_decimals() {
+		$this->assertEquals( '10.5', $this->trait->convert_to_standard_decimal( '10,5' ) );
+	}
+
+	public function test_dot_decimals_remain_unchanged() {
+		$this->assertEquals( '10.5', $this->trait->convert_to_standard_decimal( '10.5' ) );
+	}
+
+	public function test_invalid_numbers() {
+		$this->assertEquals( 'no valid. number', $this->trait->convert_to_standard_decimal( 'no valid, number' ) );
+	}
+
+	public function test_with_thousands_separator() {
+		$this->assertEquals( '1234.5', $this->trait->convert_to_standard_decimal( '1' . wc_get_price_thousand_separator() . '234,5' ) );
+	}
+
+	public function test_with_no_decimals() {
+		$this->assertEquals( '12345', $this->trait->convert_to_standard_decimal( '12345' ) );
+	}
+
+	public function test_with_different_wc_decimal_separator() {
+		add_filter(
+			'wc_get_price_decimal_separator',
+			[ $this, 'callback_filter_decimal_separator' ]
+		);
+
+		$this->assertEquals( '10.5', $this->trait->convert_to_standard_decimal( '10-5' ) );
+	}
+
+	public function callback_filter_decimal_separator() {
+		return '-';
+	}
+
+	public function tearDown(): void {
+		parent::tearDown();
+		remove_filter( 'wc_get_price_decimal_separator', [ $this, 'callback_filter_decimal_separator' ] );
+	}
+}
diff --git a/tests/Unit/Shipping/ZoneMethodsParserTest.php b/tests/Unit/Shipping/ZoneMethodsParserTest.php
index 040a16b16b..596ed7a3bc 100644
--- a/tests/Unit/Shipping/ZoneMethodsParserTest.php
+++ b/tests/Unit/Shipping/ZoneMethodsParserTest.php
@@ -46,6 +46,48 @@ public function test_returns_flat_rate_methods() {
 		$this->assertEquals( 10, $shipping_rates[0]->get_rate() );
 	}
 
+	public function test_returns_flat_rate_methods_with_decimals_and_comma() {
+		$flat_rate     = $this->createMock( WC_Shipping_Flat_Rate::class );
+		$flat_rate->id = ZoneMethodsParser::METHOD_FLAT_RATE;
+		$flat_rate->expects( $this->any() )
+			->method( 'get_option' )
+			->willReturnMap(
+				[
+					[ 'cost', null, '10,6' ],
+				]
+			);
+
+		$zone = $this->createMock( WC_Shipping_Zone::class );
+		$zone->expects( $this->any() )
+			->method( 'get_shipping_methods' )
+			->willReturn( [ $flat_rate ] );
+
+		$shipping_rates = $this->methods_parser->parse( $zone );
+		$this->assertCount( 1, $shipping_rates );
+		$this->assertEquals( 10.6, $shipping_rates[0]->get_rate() );
+	}
+
+	public function test_returns_flat_rate_methods_with_decimals_and_dot() {
+		$flat_rate     = $this->createMock( WC_Shipping_Flat_Rate::class );
+		$flat_rate->id = ZoneMethodsParser::METHOD_FLAT_RATE;
+		$flat_rate->expects( $this->any() )
+			->method( 'get_option' )
+			->willReturnMap(
+				[
+					[ 'cost', null, '10.6' ],
+				]
+			);
+
+		$zone = $this->createMock( WC_Shipping_Zone::class );
+		$zone->expects( $this->any() )
+			->method( 'get_shipping_methods' )
+			->willReturn( [ $flat_rate ] );
+
+		$shipping_rates = $this->methods_parser->parse( $zone );
+		$this->assertCount( 1, $shipping_rates );
+		$this->assertEquals( 10.6, $shipping_rates[0]->get_rate() );
+	}
+
 	public function test_returns_flat_rate_methods_including_shipping_classes() {
 		// Return three sample shipping classes.
 		$light_class          = new \stdClass();
@@ -69,10 +111,10 @@ public function test_returns_flat_rate_methods_including_shipping_classes() {
 			->willReturnMap(
 				[
 					[ 'cost', null, 10 ],
-					[ 'class_cost_0', null, 5 ],
+					[ 'class_cost_0', null, '5,20' ], // Comma decimal separator will be converted to dot.
 					[ 'class_cost_1', null, 15 ],
 					[ 'class_cost_2', null, '[qty] / 10' ],
-					[ 'no_class_cost', null, 2 ],
+					[ 'no_class_cost', null, '6,7' ],
 				]
 			);
 
@@ -103,11 +145,11 @@ function ( ShippingRate $shipping_rate ) {
 
 		foreach ( $shipping_rates as $shipping_rate ) {
 			if ( [] === $shipping_rate->get_applicable_classes() ) {
-				// The `no_class_cost` should be added to the flat rate method cost (10+2=12).
-				$this->assertEquals( 12, $shipping_rate->get_rate() );
+				// The `no_class_cost` should be added to the flat rate method cost (10+6.7=16.7).
+				$this->assertEquals( 16.7, $shipping_rate->get_rate() );
 			} elseif ( [ 'light' ] === $shipping_rate->get_applicable_classes() ) {
-				// The shipping class costs should be added to the flat rate method cost (10+5=15).
-				$this->assertEquals( 15, $shipping_rate->get_rate() );
+				// The shipping class costs should be added to the flat rate method cost (10+5.20=15.20).
+				$this->assertEquals( 15.20, $shipping_rate->get_rate() );
 			} elseif ( [ 'heavy' ] === $shipping_rate->get_applicable_classes() ) {
 				// The shipping class costs should be added to the flat rate method cost (10+15=25).
 				$this->assertEquals( 25, $shipping_rate->get_rate() );