diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index 1c7da30..63c3aa0 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -184,13 +184,6 @@
 const DRUPAL_AUTHENTICATED_RID = 'authenticated';
 
 /**
- * The number of bytes in a kilobyte.
- *
- * For more information, visit http://en.wikipedia.org/wiki/Kilobyte.
- */
-const DRUPAL_KILOBYTE = 1024;
-
-/**
  * The maximum number of characters in a module or theme name.
  */
 const DRUPAL_EXTENSION_NAME_MAX_LENGTH = 50;
diff --git a/core/includes/common.inc b/core/includes/common.inc
index 38033ac..6af931a 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -1,5 +1,6 @@
 <?php
 
+use Drupal\Component\Utility\Bytes;
 use Drupal\Component\Utility\Crypt;
 use Drupal\Component\Utility\String;
 use Drupal\Component\Utility\Tags;
@@ -1066,7 +1067,7 @@ function format_plural($count, $singular, $plural, array $args = array(), array
  *   An integer representation of the size in bytes.
  *
  * @deprecated as of Drupal 8.0. Use
- *   \Drupal\Core\Bootstrap\Bootstrap::parseSize() directly instead.
+ *   \Drupal\Component\Utility\Bytes::parseSize() directly instead.
  */
 function parse_size($size) {
   return Bootstrap::parseSize($size);
@@ -1085,11 +1086,11 @@ function parse_size($size) {
  *   A translated string representation of the size.
  */
 function format_size($size, $langcode = NULL) {
-  if ($size < DRUPAL_KILOBYTE) {
+  if ($size < Bytes::KILOBYTE) {
     return format_plural($size, '1 byte', '@count bytes', array(), array('langcode' => $langcode));
   }
   else {
-    $size = $size / DRUPAL_KILOBYTE; // Convert bytes to kilobytes.
+    $size = $size / Bytes::KILOBYTE; // Convert bytes to kilobytes.
     $units = array(
       t('@size KB', array(), array('langcode' => $langcode)),
       t('@size MB', array(), array('langcode' => $langcode)),
@@ -1101,8 +1102,8 @@ function format_size($size, $langcode = NULL) {
       t('@size YB', array(), array('langcode' => $langcode)),
     );
     foreach ($units as $unit) {
-      if (round($size, 2) >= DRUPAL_KILOBYTE) {
-        $size = $size / DRUPAL_KILOBYTE;
+      if (round($size, 2) >= Bytes::KILOBYTE) {
+        $size = $size / Bytes::KILOBYTE;
       }
       else {
         break;
diff --git a/core/lib/Drupal/Component/Utility/Bytes.php b/core/lib/Drupal/Component/Utility/Bytes.php
new file mode 100644
index 0000000..7988542
--- /dev/null
+++ b/core/lib/Drupal/Component/Utility/Bytes.php
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\Component\Bytes\Bytes.
+ */
+namespace Drupal\Component\Utility;
+
+/**
+ * Provides helper methods for manipulating byte conversions.
+ */
+class Bytes {
+
+  /**
+   * The number of bytes in a kilobyte.
+   *
+   * For more information, visit http://en.wikipedia.org/wiki/Kilobyte.
+   */
+  const KILOBYTE = 1024;
+
+  /**
+   * Parses a given byte count.
+   *
+   * @param $size
+   *   A size expressed as a number of bytes with optional SI or IEC binary unit
+   *   prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8 bytes, 9mbytes).
+   *
+   * @return
+   *   An integer representation of the size in bytes.
+   */
+  public static function parseSize($size) {
+    $unit = preg_replace('/[^bkmgtpezy]/i', '', $size); // Remove the non-unit characters from the size.
+    $size = preg_replace('/[^0-9\.]/', '', $size); // Remove the non-numeric characters from the size.
+    if ($unit) {
+      // Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
+      return round($size * pow(self::KILOBYTE, stripos('bkmgtpezy', $unit[0])));
+    }
+    else {
+      return round($size);
+    }
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Bootstrap/Bootstrap.php b/core/lib/Drupal/Core/Bootstrap/Bootstrap.php
index f29ed75..789310a 100644
--- a/core/lib/Drupal/Core/Bootstrap/Bootstrap.php
+++ b/core/lib/Drupal/Core/Bootstrap/Bootstrap.php
@@ -2,23 +2,18 @@
 
 /**
  * @file
- * Definition of Drupal\Core\Bootstrap\Bootstrap.
+ * Definition of \Drupal\Core\Bootstrap\Bootstrap.
  */
 namespace Drupal\Core\Bootstrap;
 
+use Drupal\Component\Utility\Bytes;
+
 /**
  * Provides helper methods for bootstrapping Drupal.
  */
 class Bootstrap {
 
   /**
-   * The number of bytes in a kilobyte.
-   *
-   * For more information, visit http://en.wikipedia.org/wiki/Kilobyte.
-   */
-  const DRUPAL_KILOBYTE = 1024;
-
-  /**
    * Compares the memory required for an operation to the available memory.
    *
    * @param $required
@@ -45,7 +40,7 @@ function checkMemoryLimit($required, $memory_limit = NULL) {
     // - The memory limit is set to unlimited (-1).
     // - The memory limit is greater than or equal to the memory required for
     //   the operation.
-    return ((!$memory_limit) || ($memory_limit == -1) || (self::parseSize($memory_limit) >= self::parseSize($required)));
+    return ((!$memory_limit) || ($memory_limit == -1) || (Bytes::parseSize($memory_limit) >= Bytes::parseSize($required)));
   }
 
   /**
@@ -111,26 +106,4 @@ function overrideServerVariables($variables = array()) {
     $_SERVER = $variables + $_SERVER + $defaults;
   }
 
-  /**
-   * Parses a given byte count.
-   *
-   * @param $size
-   *   A size expressed as a number of bytes with optional SI or IEC binary unit
-   *   prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8 bytes, 9mbytes).
-   *
-   * @return
-   *   An integer representation of the size in bytes.
-   */
-  function parseSize($size) {
-    $unit = preg_replace('/[^bkmgtpezy]/i', '', $size); // Remove the non-unit characters from the size.
-    $size = preg_replace('/[^0-9\.]/', '', $size); // Remove the non-numeric characters from the size.
-    if ($unit) {
-      // Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
-      return round($size * pow(self::DRUPAL_KILOBYTE, stripos('bkmgtpezy', $unit[0])));
-    }
-    else {
-      return round($size);
-    }
-  }
-
 }
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/SizeUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/SizeUnitTest.php
index a8a2662..1c1f121 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/SizeUnitTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/SizeUnitTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\system\Tests\Common;
 
+use Drupal\Component\Utility\Bytes;
 use Drupal\simpletest\UnitTestBase;
 
 /**
@@ -25,7 +26,7 @@ public static function getInfo() {
   }
 
   function setUp() {
-    $kb = DRUPAL_KILOBYTE;
+    $kb = Bytes::KILOBYTE;
     $this->exact_test_cases = array(
       '1 byte' => 1,
       '1 KB'   => $kb,