You can use the Views module to do this.

 1. Create a new view
 2. Remove sort options, fields and other default settings
 3. Add a field for "Content: Type"
 4. Expand the "advanced" part on the right and set "Use aggregation" to "Yes"
 5. Add yet another field for "Content: Type"
 6. On the second "Content: Type" field, click "Aggregation settings"
 7. Set the aggregation type to "count"
 8. The second "Content: Type" should now look like "COUNT(Content: Type)"

THIS IS NOT MY SOLUTION LOOK HERE: http://drupal.stackexchange.com/questions/15871/count-of-nodes-by-type