Calculated field enhancements in Advanced Forms Pro version 1.6.6. For more info see https://hookturn.io/2019/11/advanced-forms-pro-calculated-field-enhancements/

advanced-forms-pro-calculated-field-update-intercept.js

// This will intercept the rendered calculated field and insert the markup
// into an element with the id `#preview-container`
acf.addAction( 'af/field/calculated/value_updated', function( value, field, form ) {
  $('#preview-container').html(value);
});

// You may intercept the return values of specific fields by field name
acf.addAction( 'af/field/calculated/value_updated/name=FIELD_NAME', function( value, field, form ) {
  // …
});

// You may also intercept the return values of specific fields by field key
acf.addAction( 'af/field/calculated/value_updated/key=FIELD_KEY', function( value, field, form ) {
  // …
});

advanced-forms-pro-calculated-field-update-trigger.js

// This is the simplest format available and will trigger the update for 
// all calculated fields on the page
acf.doAction( 'af/field/calculated/update_value' );

// You may target specific fields by field name
acf.doAction( 'af/field/calculated/update_value/name=FIELD_NAME' );

// You may also target specific fields by field key
acf.doAction( 'af/field/calculated/update_value/key=FIELD_KEY' );