gistfile1.txt

<?php

add_filter( 'shortcode_atts_gf_progress_meter', function( $atts ) {

	// Update 123 to your form ID.
	if ( $atts['id'] == 123 ) {

		$count = gw_progress_meter()->get_count( $atts );
		$goal  = $atts['goal'];

		$percentage = round( $count / $goal * 100 );

		$atts['count_label'] = "{$percentage}%";
		$atts['goal_label']  = '100%';

	}

	return $atts;
} );