diff --git a/src/Strings/Multibyte/OmniString.php b/src/Strings/Multibyte/OmniString.php
--- a/src/Strings/Multibyte/OmniString.php
+++ b/src/Strings/Multibyte/OmniString.php
@@ -59,6 +59,10 @@
         return StringUtilities::endsWith($this->value, $end);
     }
 
+    public function len () : int {
+        return mb_strlen($this->value, $this->encoding);
+    }
+
     /**
      * @return string
      */
diff --git a/tests/Strings/Multibyte/OmniStringTest.php b/tests/Strings/Multibyte/OmniStringTest.php
--- a/tests/Strings/Multibyte/OmniStringTest.php
+++ b/tests/Strings/Multibyte/OmniStringTest.php
@@ -45,4 +45,8 @@
         $this->assertFalse($this->string->endsWith("bar"));
     }
 
+    public function testLen () : void {
+        $this->assertEquals(3, $this->string->len());
+    }
+
 }