Testing multiple calculated fields in Advanced Forms Pro for ACF. These resources are for the video: https://www.loom.com/share/fcf6179162374c599b61eb6a1040eb02

acf-export-group_63799935b6476.json

[
    {
        "key": "group_63799935b6476",
        "title": "Calculated Fields",
        "fields": [
            {
                "key": "field_637999367d114",
                "label": "Number 1",
                "name": "number_1",
                "aria-label": "",
                "type": "number",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "hide_admin": 0,
                "default_value": "",
                "min": "",
                "max": "",
                "placeholder": "",
                "step": "",
                "prepend": "",
                "append": ""
            },
            {
                "key": "field_6379994b7d115",
                "label": "Number 2",
                "name": "number_2",
                "aria-label": "",
                "type": "number",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "hide_admin": 0,
                "default_value": "",
                "min": "",
                "max": "",
                "placeholder": "",
                "step": "",
                "prepend": "",
                "append": ""
            },
            {
                "key": "field_637999537d118",
                "label": "Calculated 1 (Number 1 + Number 2)",
                "name": "calculated_1",
                "aria-label": "",
                "type": "calculated",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "hide_admin": 0
            },
            {
                "key": "field_6379994d7d116",
                "label": "Number 3",
                "name": "number_3",
                "aria-label": "",
                "type": "number",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "hide_admin": 0,
                "default_value": "",
                "min": "",
                "max": "",
                "placeholder": "",
                "step": "",
                "prepend": "",
                "append": ""
            },
            {
                "key": "field_6379994f7d117",
                "label": "Number 4",
                "name": "number_4",
                "aria-label": "",
                "type": "number",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "hide_admin": 0,
                "default_value": "",
                "min": "",
                "max": "",
                "placeholder": "",
                "step": "",
                "prepend": "",
                "append": ""
            },
            {
                "key": "field_637999af7d119",
                "label": "Calculated 2 (Number 3 + Number 4)",
                "name": "calculated_2",
                "aria-label": "",
                "type": "calculated",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "hide_admin": 0
            },
            {
                "key": "field_63799b410664a",
                "label": "Calculated 3 (Display all fields)",
                "name": "calculated_3",
                "aria-label": "",
                "type": "calculated",
                "instructions": "This just displays field values and is defined in the <a href=\"http:\/\/advanced-forms-release-testing.test\/wp\/wp-admin\/post.php?post=124&action=edit\">form's \"calculated\" settings<\/a>.",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "hide_admin": 0
            }
        ],
        "location": [
            [
                {
                    "param": "af_form",
                    "operator": "==",
                    "value": "form_6379991d9a109"
                }
            ]
        ],
        "menu_order": 0,
        "position": "normal",
        "style": "default",
        "label_placement": "top",
        "instruction_placement": "label",
        "hide_on_screen": "",
        "active": true,
        "description": "",
        "show_in_rest": 0
    }
]

calculated-field-snippets.php

<?php

add_filter( 'af/field/calculate_value/name=calculated_1', function () {
	return (int) af_get_field( 'number_1' ) + (int) af_get_field( 'number_2' );
}, 10, 0 );

add_filter( 'af/field/calculate_value/name=calculated_2', function () {
	return (int) af_get_field( 'number_3' ) + (int) af_get_field( 'number_4' );
}, 10, 0 );

form_6379991d9a109.json

{
    "key": "form_6379991d9a109",
    "title": "Calculated Fields",
    "display": {
        "description": "",
        "success_message": "<p>Done.<\/p>\n<p>{all_fields}<\/p>\n"
    },
    "create_entries": false,
    "restrictions": {
        "entries": false,
        "user": false,
        "schedule": false,
        "edit_own_posts": false
    },
    "emails": false,
    "editing": {
        "user": false,
        "post": false,
        "term": false
    },
    "slack": false,
    "mailchimp": false,
    "zapier": false,
    "recaptcha": false,
    "calculated": {
        "field_637999537d118": "",
        "field_637999af7d119": "",
        "field_63799b410664a": "<p>Number 1: {field:number_1}<\/p>\n<p>Number 2: {field:number_2}<\/p>\n<p>Number 3: {field:number_3}<\/p>\n<p>Number 4: {field:number_4}<\/p>\n"
    }
}