WP Forms Calculator Demo

wp_forms_calculator

add_filter ('wpforms_frontend_confirmation_message', 'restrict_form_formula', 10, 2);
function restrict_form_formula($confirmation_message, $form_data) {
	if ($form_data['id'] == 642) { /* This number is form id - so that  we only process the results for this form */
		$monthly_recurring = $_POST['wpforms']['fields'][1];  /* The id for the field you want to use in calculation */
		$ad_spent_month = $_POST['wpforms']['fields'][2];  /* The id for the field you want to use in calculation */
		$total_budget = $_POST['wpforms']['fields'][3];  /* The id for the field you want to use in calculation */
		$calculation = ($monthly_recurring * $ad_spent_month) / $total_budget;
		return $calculation;
	}
	else {
		return $confirmation_message;
	}
}