How to add a calculated field in Google Form
Google Forms is a versatile tool widely used for data collection, but it traditionally lacks direct support for calculated fields. Understanding how to add a calculated field to your Google Form can significantly enhance its functionality, allowing you to perform real-time calculations based on user inputs.
Here, we will provide a step-by-step guide on how to integrate calculated fields into your forms, a must-have skill for educators, event organizers, and business professionals who rely on dynamic data collection.
How to Install Form Facade Add-on
Step 1: Launch Google Forms
Step 2: Open a New Form
Click on the "+" icon to start a new form or select an existing form that you want to edit.
Step 3: Click on three dots and Select Get Add-Ons
Click on three dots (more options) and then go to "Get add-ons".
Step 4: Search Formfacade and Click on Install
Search for Formfacade add-on and then click on the Log in "Install" button. Log in and allow access, it will be installed successfully.
How to Open Form Facade in Google Form
Step 1: Click on the Add-On Icon and Select Formfacade
Open Formfacade by clicking on the add-on icon and then click on Formfacade.
Step 2: Go to Customize this form and Click on Proceed
Click the “Customize this form” and then “Proceed” to open the Form Facade interface in a new tab.
Step 3: Select the Field for Calculation
In the Formfacade interface, click on the gear icon next to the field that you want to calculate. This will open the field settings screen.
Step 4: Set Field Appearance and Enter Calculation Formula
1. In the field settings screen, select the “Answer” tab. Set the “Appearance” drop-down to “Read-only”. This ensures that users cannot manually enter data into this field.
2. Enter your calculation formula in the “Calculate” option. To use a form field in your calculation, type “@” and select the required field from the list that appears. Then click on Save

Example of How to add a calculated field in Google Form
1. Bill Calculator
In this example the formula is @Unit Consumed (in kWh) * @Cost of 1 unit

Preview Result
2. Attendance Calculator
In this example the formula is (@Class attended /@Total No. of classes )*100
Preview Result

3. BMI Calculator
In this example the formula is ((Weight (in kg) /(Height (in m )**2))
Preview Result

4. Average Speed Calculator
In this example, the formula is @Distance covered (in km) /Time Taken (in hr)
Preview Result

5. Simple Interest Calculator
In this example, the formula is (@Principal Interest *Rate of interest *Time period (in years))/100
Preview Result

6. Salary Calculator
This example is based on a logical condition i.e.
If Salary >= Rs. 50,000 then the tax would be 20% and if Salary < Rs. 50,000 then the tax would be 10%. The allowance is constant for 5%
Here is the formula used for calculating tax:-
IFS(Enter your salary >= 50000, 20, 10)
The formula for total salary is:
IFS(Enter your.. >= 50000,Enter your.. -0.15 * Enter your.., Enter your.. -0.05 * Enter your..)
Preview Result

Conclusion
By following these steps, you can easily add a calculated field in Google Forms using the Formfacade add-on. This feature allows you to compute and present data to users in real-time as they fill out the form, enhancing user experience and data accuracy.
How to add a calculated field in Google Form - FAQs
Can I use any other add-ons apart from Formfacade?
Yes, there are other add-ons available that offer similar functionality. However, Formfacade is one of the most popular due to its ease of use and robust features.
Can I use complex formulas for calculation?
Yes, you can use complex formulas as long as they are supported by Google Sheets’ formula syntax.
Can I change the appearance of calculated fields?
Yes, you can customize the appearance of calculated fields using various options provided by Form Facade.