Here is a simple demo to show how the formula fields can be used 

We have 2 types of fields for calculations:

You can use any of the functions or operations documented here: Supported math operators, formulas and functions

There is also a way to do calculations with ConfiForms Field Definition Rules


Here we have a simple form with 4 fields:

2 of number types and 3 of formula types

We have the following formulas in this form:

Example configuration of a formula field:



Stored data



Storage format for this demo:

<ac:structured-macro ac:macro-id="e44fca82-119b-4e79-b70a-1d521f0f13e3" ac:name="confiform" ac:schema-version="1">
  <ac:parameter ac:name="formName">myform1</ac:parameter>
  <ac:rich-text-body>
    <ac:structured-macro ac:macro-id="9930843c-b7ee-493d-b93d-6c91cf13da7a" ac:name="confiform-entry-register" ac:schema-version="1">
      <ac:parameter ac:name="embedded">true</ac:parameter>
      <ac:rich-text-body>
        <p>
          <br/>
        </p>
      </ac:rich-text-body>
    </ac:structured-macro>
    <p>
      <ac:structured-macro ac:macro-id="c1d112a1-145d-4822-9263-57e7f1d95202" ac:name="confiform-field-definition" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">f1</ac:parameter>
        <ac:parameter ac:name="fieldLabel">f1</ac:parameter>
        <ac:parameter ac:name="type">number</ac:parameter>
        <ac:parameter ac:name="required">true</ac:parameter>
      </ac:structured-macro>
    </p>
    <p>
      <ac:structured-macro ac:macro-id="5b285aed-c238-42cb-8fb0-74b504f51edd" ac:name="confiform-field-definition" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">f2</ac:parameter>
        <ac:parameter ac:name="fieldLabel">f2</ac:parameter>
        <ac:parameter ac:name="type">number</ac:parameter>
        <ac:parameter ac:name="required">true</ac:parameter>
      </ac:structured-macro>
    </p>
    <p>
      <ac:structured-macro ac:macro-id="9981f97b-d090-401d-95d2-b19d45a4df9f" ac:name="confiform-field-definition" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">myformula1</ac:parameter>
        <ac:parameter ac:name="fieldLabel">My formula 1</ac:parameter>
        <ac:parameter ac:name="extras">([entry.f1] + [entry.f2])</ac:parameter>
        <ac:parameter ac:name="type">formula</ac:parameter>
      </ac:structured-macro>
    </p>
    <p>
      <ac:structured-macro ac:macro-id="f6b5b3d7-3462-4068-b23c-2ccee3789f66" ac:name="confiform-field-definition" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">myformula2</ac:parameter>
        <ac:parameter ac:name="fieldLabel">My formula 2</ac:parameter>
        <ac:parameter ac:name="extras">CONCAT("Some random: ", ((RANDOM() + [entry.f1] - [entry.f2] + NOW())))</ac:parameter>
        <ac:parameter ac:name="type">formula</ac:parameter>
      </ac:structured-macro>
    </p>
  </ac:rich-text-body>
</ac:structured-macro>
<p>Stored data</p>
<ac:structured-macro ac:macro-id="1d573801-7d23-412f-aa1e-c3c04d1fcc63" ac:name="confiform-table" ac:schema-version="1">
  <ac:parameter ac:name="formName">myform1</ac:parameter>
  <ac:rich-text-body>
    <p>
      <ac:structured-macro ac:macro-id="dc71204e-5341-4543-af04-45ab036c827d" ac:name="confiform-field" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">f1</ac:parameter>
      </ac:structured-macro>
    </p>
    <p>
      <ac:structured-macro ac:macro-id="12af5c9f-b5bb-475e-b9c1-470d60b3bd6c" ac:name="confiform-field" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">f2</ac:parameter>
      </ac:structured-macro>
    </p>
    <p>
      <ac:structured-macro ac:macro-id="0c76996a-654f-4b77-848b-9d8b2212a85f" ac:name="confiform-field" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">myformula1</ac:parameter>
      </ac:structured-macro>
    </p>
    <p>
      <ac:structured-macro ac:macro-id="9a8cf996-366b-4a8b-be43-da01d32dc449" ac:name="confiform-field" ac:schema-version="1">
        <ac:parameter ac:name="fieldName">myformula2</ac:parameter>
      </ac:structured-macro>
    </p>
  </ac:rich-text-body>
</ac:structured-macro>