---
title: "Configure calculated number fields"
slug: "configure-calculated-number-fields"
updated: 2026-04-12T09:01:55Z
published: 2026-04-12T09:01:55Z
canonical: "knowledge.lightico.com/configure-calculated-number-fields"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://knowledge.lightico.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Configure calculated number fields

Forms allow you to define a number Attribute field as a calculated field. Instead of relying on agent or customer input, the field automatically computes its value based on a mathematical expression that uses other number Attributes.

The result is a Form that is more accurate, guided, and consistent—while reducing manual input and validation effort for both agents and customers.

---

## How it works

### Define a calculated number Attribute

When configuring a number Attribute field in a Form, you can choose to define its value using a calculation instead of manual input.

- Use standard mathematical operators: +, −, ×, ÷, and brackets
- Reference other number Attributes in the Form

**Example** A monthly payment field can be calculated automatically based on the loan amount and loan length, that are entered by the agent or customer.

![](https://cdn.document360.io/473bb8c5-ff1b-4930-8109-2321ac6ab967/Images/Documentation/image(429).png)

### Automatic real-time updates

During Form completion, the calculated field updates dynamically:

- Recalculates immediately when source values change
- Applies to both agent and customer input

### Read-only behavior

Calculated fields are automatically read-only in the Form:

- Agents and customers can view the value but cannot edit it
- The value is fully controlled by the calculation
- Prevents accidental or intentional overrides

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## Common use cases

### Financial calculations

Automatically calculate derived values such as:

- Monthly salary from yearly salary
- Loan installments from a total amount
- Discounts, fees, or totals based on agent or customer input

### Standardized data entry

Ensure calculated values are always consistent, without relying on agent or customer accuracy.

### Guided Form completion

Show computed results as the agent or customer fills out the Form, helping them understand outcomes immediately.

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## Configure a calculated field

**To configure a calculated number Attribute field in a Form:**

1. Add a number Attribute field to the Form.
2. Select the field to open its settings panel.
3. Enable the **Calculated value** option. ![](https://cdn.document360.io/473bb8c5-ff1b-4930-8109-2321ac6ab967/Images/Documentation/image(430).png)
4. In the Create new calculation dialog, define the mathematical operator using:
  - **Number Attributes** – type @ -OR- click the Attribute icon to select an Attribute
  - **Mathematical operator** – type +, -, *, /, (, ) (* = multiply, and / = divide) -OR- click the operator icon to select an operator
5. Click **Add**. ![](https://cdn.document360.io/473bb8c5-ff1b-4930-8109-2321ac6ab967/Images/Documentation/image(431).png) The calculation is configured.

### Edit a calculation

**To update an existing calculation:**

1. Select the field in the Form builder.
2. In the field settings panel, click **Edit calculation**.
3. Modify the expression as needed.
4. Click **Update**.