diff --git a/app/assets/javascripts/application/search.js b/app/assets/javascripts/application/search.js
index f99cd6b2ecc185fa24e74db2dcc690ce22ec233e..4046990f11b7b1b1a11f4595c8e0f47053419d08 100644
--- a/app/assets/javascripts/application/search.js
+++ b/app/assets/javascripts/application/search.js
@@ -468,3 +468,42 @@ var runDropdown = function(element) {
     $(element).next().data('dropdown',  'closed');
   }
 };
+
+
+var getElementsNumber = function(className) {
+
+  $.ajax({
+      url: '/search/get_class_size',
+      data: { class: className },
+      dataType: "json",
+      success: function(data) {
+        switch(className) {
+          case 'LearningObject':
+            $('.search-input input').attr('placeholder', "Buscar em " + data.number + " conteúdos");
+          break;
+          case 'Collection':
+            $('.search-input input').attr('placeholder', "Buscar em " + data.number + " coleções");
+          break;
+          case 'User':
+            $('.search-input input').attr('placeholder', "Buscar em " + data.number + " usuários");
+          break;
+          default:
+          $('.search-input input').attr('placeholder', "Buscar conteúdo");
+        }
+      },
+      error: function() {
+        $('.search-input input').attr('placeholder', "Buscar conteúdo");
+      }
+  });
+};
+
+
+$(document).ready (function(){
+
+  getElementsNumber('LearningObject');
+
+  $('.search-input select').change( function(){
+    getElementsNumber( $(this).val());
+  })
+
+});
diff --git a/app/controllers/search_controller.rb b/app/controllers/search_controller.rb
index 98ffbd562839ba7e581120ad7b1f237f74286657..dc7d2368f4456c1a5387cde2ce22b284694fab18 100644
--- a/app/controllers/search_controller.rb
+++ b/app/controllers/search_controller.rb
@@ -51,6 +51,11 @@ class SearchController < ApplicationController
     render json: autocomplete_search(Object.const_get(params[:search_class]), params_hash, get_thumbnail)
   end
 
+  def get_class_size
+    className = params[:class]
+    render json: { number: Object.const_get(className).count }
+  end
+
   private
 
   def autocomplete_search(search_class, params_hash={}, get_thumbnail)
@@ -126,6 +131,7 @@ class SearchController < ApplicationController
     end
   end
 
+
   private
 
   def validate_object
diff --git a/app/views/shared/application/_search.erb b/app/views/shared/application/_search.erb
index 42612350832dd6f2886afb3e1b5d87c30b297786..98bd06af1ea2bd07eb93300c5d9d383f0327aeb9 100644
--- a/app/views/shared/application/_search.erb
+++ b/app/views/shared/application/_search.erb
@@ -1,7 +1,7 @@
 <div class="search-input">
   <form action="/search" method="get">
     <div class="input-group" id="search">
-      <input type="text" placeholder="buscar em <%= number_with_delimiter(LearningObject.count, delimiter: ".") %> conteúdos" class="form-control" name="query" id="main_search">
+      <input type="text" placeholder="" class="form-control" name="query" id="main_search">
       <select name="search_class" id="search_class" class="form-control">
         <option value="LearningObject" selected>Conteúdos Educacionais</option>
         <option value="Collection">Coleções</option>
@@ -13,4 +13,4 @@
     </div>
   </form>
   <input type="hidden" id="search_class" value=""/>
-</div>
\ No newline at end of file
+</div>
diff --git a/config/routes.rb b/config/routes.rb
index dc72339b3f249719b33df56c3bb4ee58d4337cfd..47da59df4fc0cc5d82eb98d0e445f283c7980015 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -130,6 +130,7 @@ Rails.application.routes.draw do
   get '/search' => 'search#index', as: 'search'
   get '/search/fetch' => 'search#fetch', as: 'search_fetch'
   get '/autocomplete' => 'search#autocomplete'
+  get '/search/get_class_size' => 'search#get_class_size', as: :get_class_size
 
   get '/subject/:id' => 'welcome#subject', as: 'subject_index'
   get '/add_file' => 'welcome#add_file'