diff --git a/src/Rateable.php b/src/Rateable.php
index 231fbf2..1ebab07 100755
--- a/src/Rateable.php
+++ b/src/Rateable.php
@@ -3,6 +3,7 @@
 namespace willvincent\Rateable;
 
 use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Config;
 
 trait Rateable
 {
@@ -15,22 +16,38 @@ trait Rateable
      *
      * @return Rating
      */
-    public function rate($value, $comment = null)
+
+     private function byUser($user_id = null) {
+        if(!! $user_id) {
+            return Auth::id();
+        }
+
+         $userClass = Config::get('auth.model');
+          if (is_null($userClass)) {
+            $userClass = Config::get('auth.providers.users.model');
+          }
+
+        return (!! $userClass::whereId($user_id)->count())? $user_id: Auth::id();
+     }
+    
+    public function rate($value, $comment = null, $user_id = null)
     {
+        $user_id = $this->byUser($user_id);
         $rating = new Rating();
         $rating->rating = $value;
         $rating->comment = $comment;
-        $rating->user_id = Auth::id();
+        $rating->user_id = $user_id;
 
         $this->ratings()->save($rating);
     }
 
-    public function rateOnce($value, $comment = null)
+    public function rateOnce($value, $comment = null, $user_id = null)
     {
+        $user_id = $this->byUser($user_id);
         $rating = Rating::query()
             ->where('rateable_type', '=', $this->getMorphClass())
             ->where('rateable_id', '=', $this->id)
-            ->where('user_id', '=', Auth::id())
+            ->where('user_id', '=', $user_id)
             ->first()
         ;
 
@@ -68,22 +85,30 @@ public function usersRated()
         return $this->ratings()->groupBy('user_id')->pluck('user_id')->count();
     }
 
-    public function userAverageRating()
+    public function userAverageRating($user_id = null)
     {
-        return $this->ratings()->where('user_id', Auth::id())->avg('rating');
+        $user_id = $this->byUser($user_id);
+        return $this->ratings()->where('user_id', $user_id)->avg('rating');
     }
 
-    public function userSumRating()
+    public function userSumRating($user_id = null)
     {
-        return $this->ratings()->where('user_id', Auth::id())->sum('rating');
+        $user_id = $this->byUser($user_id);
+        return $this->ratings()->where('user_id', $user_id)->sum('rating');
     }
 
-    public function ratingPercent($max = 5)
+    public function ratingPercent($max = 5, bool $rounded = false)
     {
         $quantity = $this->ratings()->count();
         $total = $this->sumRating();
+        // return "$total || $quantity";
 
-        return ($quantity * $max) > 0 ? $total / (($quantity * $max) / 100) : 0;
+        $is_rounded = is_bool($rounded)? $rounded: false;
+        if($rounded) {
+            return ($quantity * $max) > 0 ? ceil(($total / ($quantity * $max)) * 100) : 0;
+        } else { 
+            return ($quantity * $max) > 0 ? $total / (($quantity * $max) / 100) : 0;
+        }
     }
 
     // Getters