Hi thank you for the suggestion.
The issue is that on the php side while I’am saving the new value I need to get the values of other ACF fields, something like
$total = get_field(‘price’) * get_field(‘qty’);
update_field(‘total’, $total);
BUT the issue is that I cannot use get_field(‘xxxx’) as the field xxx is not yet saved in the DB (as is a new post).