WpRecipes.com - Daily recipes to cook with WordPress

As usual, let's start by pasting the function in your functions.php file:

function get_category_id($cat_name){
	$term = get_term_by('name', $cat_name, 'category');
	return $term->term_id;
}

Once you saved the file, just call the function with your category name as a parameter. Example:

$category_ID = get_category_id('WordPress Tutorials');