Reading Time for WordPress post

content.php

<?php

$mycontent = $post->post_content; // wordpress users only
$word      = str_word_count( strip_tags( $mycontent ) );
$m         = floor( $word / 200 );
$s         = floor( $word % 200 / ( 200 / 60 ) );
$estS      = $s . ' Sekunde' . ( $s == 1 ? '' : 'n' );
$estMs     = $m . ' Minute' . ( $m == 1 ? '' : 'n' ) . ', ' . $s . ' Sekunde' . ( $s == 1 ? '' : 'n' );

?>

<article>
	<?php
		if ( $m == 0 ) {
		    echo $estS;
		} else {
		    echo $estMs;
		}
	?> Lesezeit
</article>