Calculate the average reading time for a blog post

readtime.php

// Get the post content (within the Loop)
$copy = get_the_content();
// Strip all HTML from the content
$cleaned = strip_tags($copy);
// Get the word count
$word_count = str_word_count($cleaned, 0);
// Set up string to use
$mins = '';
// Calculate read time in min (based on average 230 WPM)
if (floor($word_count / 230) < 1) : $mins = '1'; else : $mins = floor($word_count / 230); endif;
$reading_time = $mins . ' min read';
// echo $reading_time wherever you need it