Estimate Reading Time For Wordpress

rb_eta.php

/** Estimate Reading Time
 *----------------*/
if( !function_exists('rb_timeline_eta') ) {
  function rb_timeline_eta(){
    global $post;
    $words_per_minute = 270;
    $words_per_second = $words_per_minute / 60;
    $post_content = $post->post_content;
    $word_count = str_word_count(strip_tags($post_content));
    
    $total_reading_time = $word_count / $words_per_second;
    
    $reading_time_minutes = round( $total_reading_time / 60 );

    $reading_time_seconds =  round( $total_reading_time - $reading_time_minutes * 60 );

    if( $reading_time_minutes <= 0 ) {
      $reading_time_minutes  = 1;
    }
    return sprintf('%d %s %s', 
      $reading_time_minutes,
      __('min','dw-timeline'),
      __('read','dw-timeline')
    );
  }
}