How to build a property valuation calculator in Bubble

A property valuation calculator in Bubble is basically a form where the user enters property info (size, location, bedrooms, etc.), and Bubble uses workflows to compute a value using a formula you define. You create input fields, a workflow that runs when the user clicks “Calculate,” and store or show the result. Bubble doesn’t compute anything automatically—you build the formula using “Calculate formula” in expressions or a backend workflow if you want it saved and reusable.

Build the Valuation Calculator

The core idea: user enters data → Bubble runs your formula → result is shown or stored. You create all fields as Input elements, then add a Calculate button with a workflow that updates a custom state or creates a Valuation record.

• Make a new Data Type called Property_Valuation with fields like size (number), bedrooms (number), location (text), calculated_value (number).
• Add Input elements on the page: Input Size, Input Bedrooms, Dropdown Location.
• Decide your formula. Example: value = size _ 1200 + bedrooms _ 8000 + location\_adjustment.
• Store location\_adjustment as an Option Set or use a conditional expression like: “Dropdown Location’s value is ‘Downtown’ :formatted as number”.

Create the Workflow

When user clicks Calculate, run “Make changes to thing” or “Create a new thing”. If you don’t need to save it, set a Custom state to show the result instantly.

// Example custom state calculation inside a workflow action
Set state Result_Value = (Input Size's value * 1200) + (Input Bedrooms's value * 8000) + Dropdown Location's value's adjustment

Display the Result

Add a Text element and set its content to the custom state or the saved Property_Valuation’s calculated_value. Bubble recomputes instantly.

• To reuse calculation elsewhere, move formula to a Backend Workflow, pass parameters (size, bedrooms, location), and return calculated\_value.
• Use Privacy Rules if storing valuations per user so only the creator can see them.