diff --git a/src/Storage/SizeUnit.php b/src/Storage/SizeUnit.php
new file mode 100644
index 0000000..8356b8e
--- /dev/null
+++ b/src/Storage/SizeUnit.php
@@ -0,0 +1,65 @@
+<?php
+declare(strict_types=1);
+
+namespace Megio\Storage;
+
+enum SizeUnit: string
+{
+    case Bytes = 'B';
+    case KiloBytes = 'KB';
+    case MegaBytes = 'MB';
+    case GigaBytes = 'GB';
+    case TeraBytes = 'TB';
+    case PetaBytes = 'PB';
+    
+    public static function fromPhpIniAlias(string $unit): self
+    {
+        $unit = strtoupper($unit);
+        
+        return match ($unit) {
+            'B' => self::Bytes,
+            'K' => self::KiloBytes,
+            'M' => self::MegaBytes,
+            'G' => self::GigaBytes,
+            'T' => self::TeraBytes,
+            'P' => self::PetaBytes,
+            default => throw new \InvalidArgumentException("Invalid unit: $unit"),
+        };
+    }
+    
+    public static function getIdealUnit(float $size): self
+    {
+        $unit = self::Bytes;
+        
+        while ($size >= 1024 && $unit !== self::PetaBytes) {
+            $size /= 1024;
+            $unit = match ($unit) {
+                self::Bytes => self::KiloBytes,
+                self::KiloBytes => self::MegaBytes,
+                self::MegaBytes => self::GigaBytes,
+                self::GigaBytes => self::TeraBytes,
+            };
+        }
+        
+        return $unit;
+    }
+    
+    public static function convert(float $size, SizeUnit $sourceUnit, SizeUnit $targetUnit): float
+    {
+        return $size * $sourceUnit->getMultiplier($targetUnit);
+    }
+    
+    public function getMultiplier(SizeUnit $targetUnit): float
+    {
+        $units = [
+            self::Bytes->value => 1,
+            self::KiloBytes->value => 1024,
+            self::MegaBytes->value => 1024 ** 2,
+            self::GigaBytes->value => 1024 ** 3,
+            self::TeraBytes->value => 1024 ** 4,
+            self::PetaBytes->value => 1024 ** 5,
+        ];
+        
+        return $units[$this->value] / $units[$targetUnit->value];
+    }
+}
\ No newline at end of file
diff --git a/src/Storage/StorageHelper.php b/src/Storage/StorageHelper.php
new file mode 100644
index 0000000..4028461
--- /dev/null
+++ b/src/Storage/StorageHelper.php
@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+namespace Megio\Storage;
+
+use Symfony\Component\HttpFoundation\File\UploadedFile;
+
+class StorageHelper
+{
+    public static function getMaxFileSize(SizeUnit $targetUnit = SizeUnit::Bytes): float
+    {
+        $iniMaxFileSize = (string)ini_get('upload_max_filesize');
+        $iniUnit = strtoupper(substr($iniMaxFileSize, -1));
+        $iniSize = (int)substr($iniMaxFileSize, 0, -1);
+        
+        return SizeUnit::fromPhpIniAlias($iniUnit)->getMultiplier($targetUnit) * $iniSize;
+    }
+    
+    public static function isFileSizeOk(UploadedFile $file): bool
+    {
+        return $file->getSize() <= self::getMaxFileSize();
+    }
+}
\ No newline at end of file