We can achieve this by using custom shortcode. Please add this code in your theme’s or child theme’s functions.php file:


add_shortcode( 'count-repeats', 'count_repeat_func' );
function count_repeat_func($atts) {
return sizeof(get_post_meta( $atts['post-id'], 'wpcf-' . $atts['field'], false ));
}


Then you can use this ShortCode. You should wrap this ShortCode in an HTML Conditional to check if the Field does exist, as other wise unexpected results can be produced:

[count-repeats post-id="6184" field="url"]


More details: https://wp-types.com/forums/topic/how-to-count-repeated-field/#post-412707