How to use the Calculated field

Step 1: Navigate to the ‘Forms’ module, and open a new ‘Dynamic form’. 

Step 2: Select two (or more) number fields, and select a calculated field.

Step 3: Rename the number fields

Each number field needs to have a unique display name, so we’ll rename each of them.

Step 4: We can make the formula in the calculated field. 
Copy & paste the ‘display name’ of the number fields into formula. 

Step 5: Give a name to the form, and select an owner.

After this, you can ‘save’ the form.

Step 6: Calculation

When you fill in the number fields, the calculated field will do the calculation of the formula.