| Formflow

Introduction

The Calculation Node allows you to create powerful, real-time formulas inside your form flows.
It automatically detects numbers from user inputs and uses them in mathematical expressions — similar to Google Sheets or Excel formulas.

This makes it easy to build:

Quoting tools
Price calculators
Loan/mortgage estimators
Budget planners
Custom scoring systems
Any form that needs dynamic numerical output

Calculation Node is Version 1, and additional features will continue to be added.

How It Works

The Calculation Node evaluates user inputs and returns a numerical result based on the expression you set.

The system automatically:

Detects numbers from Short Text fields
Detects numbers inside Multiple Choice options (e.g., “$49/day”)
Filters out non-numeric characters
Returns a clean numeric value for calculation

You can also build formulas using expressions such as:

+ (add)
- (subtract)
* (multiply)
/ (divide)
Parentheses ( ) for grouping

Example: Car Rental Cost Calculator

Below is the example used in the demonstration from the video.

Step 1 — Create Input Fields

Add a Short Text question:
“How many days do you want the car?”
- When a user types “7 days”, the system automatically extracts 7.
Add a Multiple Choice question:
“What type of car do you want to rent?”
Example options with embedded pricing:
- SUV — 49/day
- Sedan — 39/day
- Hatchback — 19/day
- Bicycle — 3/day

Any number typed in the option will be detected.

You can also reorder the choices by dragging them — option sorting is now supported.

Step 2 — Add a Calculation Node

On the Canvas, drag in the Calculator node.
Name your calculation. Example: Car Estimate.
Build your formula using the detected inputs.

Example formula:

How many days * Type of car

The node will reference:

The numeric value from the “days” input
The numeric value from the selected car option

The calculator automatically displays the evaluated result while you build the formula.

Step 3 — Display the Calculation Result

Add a Text element on the next page.
Write your output message, for example:
Your car is ${{Car Estimate}}
Publish the form.

When the user completes the form, the value from the Calculation Node will appear in the text element.

Live Example

If a user enters:

7 days
$39/day (Sedan)

Formula:
7 * 39
Result:
273

Your final screen might display:
“Your car is $273.”

Additional Features

Multiple Calculators

You can add more than one Calculation Node to the same form — each with separate formulas.

Expression Support

The Calculation Node supports expressions similar to spreadsheets:

Nested parentheses
Order of operations
Complex formula building

Automatic Number Detection

The system only uses numbers detected in:

Short text fields
Multiple choice options

Non-numeric characters (letters, symbols, brackets, text) are ignored automatically.

Updated Input Option Controls

Multiple Choice options can now be reordered by dragging, improving form-building workflow.

Best Practices

Keep Input Fields Clear

If your question expects a number, use Short Text instead of long text for better detection.

Use Descriptive Labels

Name your calculation clearly (e.g., “Monthly Payment”, “EstimateTotal”, “ScoreOutput”).

Combine Calculators

You can create multi-step calculations by chaining multiple Calculator nodes.

Use Parentheses for Clarity

When formulas get more complex, group them with ( ) to avoid unexpected results.

Troubleshooting

The calculator is returning “NaN” (not a number)

Check that:

The user inputs include numbers
The multiple-choice options include numeric values
The formula references the correct fields

The calculation result is wrong