diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad6a2b1..d051d01 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 CHANGELOG for 1.x
 ===================
+## v1.0.3 - (2024-01-11)
+
+### Fix
+
+- `MathUtils::formatBytes` : Use 1000 instead of 1024 for calculate
+
 ## v1.0.2 - (2024-01-11)
 
 ### Added
diff --git a/src/Utils/MathUtils.php b/src/Utils/MathUtils.php
index 14a7856..ef6edfe 100644
--- a/src/Utils/MathUtils.php
+++ b/src/Utils/MathUtils.php
@@ -24,10 +24,10 @@ public static function calculatePercentage(?float $partial, float $total, ?int $
      */
     public static function formatBytes(float $size, int $precision = 2): string
     {
-        $base = log($size, 1024);
+        $base = log($size, 1000);
         $suffixes = ['B', 'KB', 'MB', 'GB', 'TB'];
 
         $floor = floor($base);
-        return round(pow(1024, $base - $floor), $precision) . ' ' . $suffixes[$floor];
+        return round(pow(1000, $base - $floor), $precision) . ' ' . $suffixes[$floor];
     }
 }
diff --git a/tests/Utils/MathUtilsTest.php b/tests/Utils/MathUtilsTest.php
index 13e015a..a73c067 100644
--- a/tests/Utils/MathUtilsTest.php
+++ b/tests/Utils/MathUtilsTest.php
@@ -62,10 +62,10 @@ public function formatBytesProvider(): array
                 // precision
                 null,
             ],
-            '1.26 KB' => ['1.26 KB', 1290, null],
-            '536.918 MB' => ['536.918 MB', 562999000, 3],
-            '880 GB' => ['880 GB', 945000000000, 0],
-            '382.86 TB' => ['382.86 TB', 420956000000000, 2],
+            '1.29 KB' => ['1.29 KB', 1290, null],
+            '562.999 MB' => ['562.999 MB', 562999000, 3],
+            '945 GB' => ['945 GB', 945000000000, 0],
+            '420.96 TB' => ['420.96 TB', 420956000000000, 2],
         ];
     }
 }