diff --git a/src/data-structures/doubly-linked-list/DoublyLinkedList.js b/src/data-structures/doubly-linked-list/DoublyLinkedList.js
index 6c3306b6..d576f360 100644
--- a/src/data-structures/doubly-linked-list/DoublyLinkedList.js
+++ b/src/data-structures/doubly-linked-list/DoublyLinkedList.js
@@ -213,6 +213,10 @@ export default class DoublyLinkedList {
     return nodes;
   }
 
+  size() {
+    return this.toArray().length;
+  }
+
   /**
    * @param {*[]} values - Array of values that need to be converted to linked list.
    * @return {DoublyLinkedList}
diff --git a/src/data-structures/linked-list/LinkedList.js b/src/data-structures/linked-list/LinkedList.js
index ba7d0e3e..1d565d7c 100644
--- a/src/data-structures/linked-list/LinkedList.js
+++ b/src/data-structures/linked-list/LinkedList.js
@@ -233,6 +233,13 @@ export default class LinkedList {
 
     return nodes;
   }
+  
+  /**
+   * @return {number}
+   */
+  size() {
+    return this.toArray().length;
+  }
 
   /**
    * @param {function} [callback]
diff --git a/src/data-structures/queue/Queue.js b/src/data-structures/queue/Queue.js
index 64e646fc..503387bb 100644
--- a/src/data-structures/queue/Queue.js
+++ b/src/data-structures/queue/Queue.js
@@ -47,6 +47,14 @@ export default class Queue {
     return removedHead ? removedHead.value : null;
   }
 
+  /**
+   * @return {number}
+   */
+  size() {
+    return this.linkedList.size();
+  }
+
+  
   /**
    * @param [callback]
    * @return {string}
diff --git a/src/data-structures/stack/Stack.js b/src/data-structures/stack/Stack.js
index 8d061412..2ae54073 100644
--- a/src/data-structures/stack/Stack.js
+++ b/src/data-structures/stack/Stack.js
@@ -48,6 +48,13 @@ export default class Stack {
     return removedHead ? removedHead.value : null;
   }
 
+  /**
+   * @return {number}
+   */
+  size() {
+    return this.linkedList.size();
+  }
+
   /**
    * @return {*[]}
    */