Calculation Support for Forms

A Calculation field automatically computes a numeric value from other fields in your form — no coding required. As a visitor fills out the form, the calculated result updates in real time. You can use it to display running totals, scores, pricing summaries, or any numeric result you want to derive from what someone has entered.
Step 1: Add a Calculation Field to Your Form
Open the form you want to edit from People > Forms
Click the Add A New Block
 button in the top-left corner of the form editor
Click Calculation
 in the block list
A new field labelled Total
 will appear at the bottom of your form, showing a live value of 0
The field is read-only on your published form — visitors cannot type into it. It updates automatically as they fill out other fields.
Step 2: Configure the Calculation Settings
Clicking on the Calculation field opens the Calculation Settings
 panel on the right. Here is what each setting does:
Label
: 
The name displayed above the field on your form. By default this is "Total" — change it to anything that makes sense, like "Registration Fee" or "Your Score".
Description
: 
Optional helper text shown below the label. Use this to explain what the value represents, e.g. "Includes all selected items plus a $2 processing fee."
Display
: Controls whether the computed value is shown to the visitor:
Visible: The calculated value is displayed on the form as the visitor fills it in
Hidden: The field computes silently in the background — the visitor never sees it, but the value is included in the form submission
Use Hidden
 when you want to record a score or internal total without showing it on the form itself.
Note:
 Even when hidden from visitors, the calculation still runs and the result is saved with every form submission. This is useful for scoring quizzes or tagging submissions by total value.
Calculation Method
: Choose how the field arrives at its value
Auto (Total All): Automatically adds up the calc values from every eligible field in the form
Select Fields:  You choose specific fields and define the math operation between them
Using Auto Mode
Auto mode is the simplest option. Switch the Calculation Method
 to Auto (Total All)
 and the field will sum all eligible fields in your form whenever a visitor interacts with them.
Eligible fields and how their values are counted:
Number inputs
 — uses the number the visitor types in
Checkboxes
 — uses the field's configured Calculation Value when checked; 0 when unchecked
Choice fields (dropdown / radio / checkboxes)
 — uses the Calculation Value of each selected option
Auto mode ignores label blocks, captcha fields, and other calculation fields.
Using Select Fields Mode
Select Fields mode lets you build a custom formula. Switch Calculation Method
 to Select Fields
 to see the field list.
Click + Add Field
 to add the first field in your formula
Use the dropdown to pick which form field to start with
Click + Add Field
 again to add a second field
For each subsequent field, choose the operation
 to apply:
Continue adding fields as needed
To remove a field from the formula, click the ×
 button on that row
Operations are applied in sequence from top to bottom (there is no bracket grouping). For example: Field A + Field B × Field C
 will first add A and B, then multiply by C.
Step 3: Set a Prefix or Suffix
Use the Prefix
 and Suffix
 fields to add symbols or labels around the displayed value:
Prefix
 — appears before the number (e.g. $
 → displays $42
)
Suffix
 — appears after the number (e.g. pts
 → displays 42pts
, or USD
 → displays 42USD
)
Leave either field blank if you don't need it.
Step 4: Set Calculation Values on Other Fields
For the Calculation field to produce meaningful results, your other fields need Calculation Values
 assigned. Here's how to set them for each field type:
Checkbox fields
Click the settings gear on a Checkbox field to open its settings panel. You'll see a Calculation Value
 field near the bottom.
Enter the number this checkbox should contribute when it is checked. If left blank, the checkbox contributes 0.
Choice fields (dropdown, radio, checkboxes)
Click the settings gear on a Choice field. In the Items
 section, each option has a small Calc
 column next to its name.
Enter the numeric value each option should contribute when selected. Leave it blank for options that should contribute 0.
Number inputs
Number fields don't have a separate Calculation Value — the Calculation field simply uses whatever number the visitor types into that field directly.
Step 5: Save Your Form
Click Save
 in the top-right of the form editor when you're done. The Calculation field is now live and will update in real time as visitors fill out the form.
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Tips and FAQs
Can I have more than one Calculation field?
Yes. You can add multiple Calculation fields to a single form. Each one can use a different method and reference different fields.
Can a Calculation field reference another Calculation field?
No. Calculation fields cannot be used as inputs in other Calculation fields — they are excluded from the field picker automatically.
How are decimals handled?
Results are rounded to two decimal places. Whole-number results are displayed without any decimal point (e.g. $42
 not $42.00
).