WooCommerce add weight unit after price

functions.php

<?php
// Add R xx.xx per KG
add_action( 'woocommerce_price_html', 'wc_custom_price', 10, 2 );
function wc_custom_price( $price, $product ) {
	return sprintf( __( '%s per KG', 'woocommerce' ), woocommerce_price( $product->get_price() ) );
}
?>

@brandonecarr I am using the Flatsome theme where do I go to add the above code?
Thank you!

Thanks!

You get your sites weight unit using the following.
get_option('woocommerce_weight_unit' )