Magento 1 get products per page for category product list

Here you just need bellow code for get list page product limit range get.

$allowedValues = Mage::getStoreConfig('catalog/frontend/grid_per_page_values'); 
    $grid_per_page_values = explode(",", $allowedValues);
    foreach($grid_per_page_values as $gridperpage){
        echo $gridperpage;
    }