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Form Calculations

With the 123FormBuilder online form builder, you can perform calculations on your web forms & surveys. Use form calculations to add mathematical operations between your fields on your online forms.

Assign Values

First, you need to assign the values to your products/services. To do so, please add a choice field (single/multiple choice or dropdown field) and list the available choices.

product list

Click the field to open its options in the left-side panel and select Value / Price. Next to each option type their correspondent price.

assign values

If you need the user to type the amount, add a number field and assign the value “1”. By default, a field has no value assigned to it, meaning the input will be multiplied with zero. The form will calculate input value X 1. ( e.g user types 123, the number field will calculate 123 X 1= 123  instead of 123 X 0= 0).

product list

When you are using a number (input) field, it works as a quantity field. Assign the full price to the field (e.g $150). If the user types 2, the calculation will be 2 X 150 = 300$.

product list

Create formulas

To create mathematical operations on your form, add a formula field on the form. This field will show the total value in real-time.

Click to add a formula field. A calculator will appear where you can add operations between your form fields. Use the Add field button within the calculator to add your form fields. Once the field is selected, it will be automatically added to the formula. You can use your keyboard to add operators and values.

formula field

You can also add calculations between Date fields. The operation between two Date fields will return the value in the number of days.

form calculations

  • Important Notes
    You don’t need to enable payments on your form in order to use form calculations. Formula fields are read-only.

Here how the form configuration used in this guide is calculating.

If you are using another version, check out this article with the same subject.

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Frequently Asked Questions

Here is a list of the most frequently asked questions. For more FAQs, please browse through the  FAQs page.

Is this service free?
Yes, we offer a free form builder service. Just sign up to the Basic plan and you are all set. This plan is forever free, but you are limited with a few features only, such as 5 forms per account, 100 submissions per month and you have to keep the backlink to 123FormBuilder on your forms. Check out our features matrix for more information.
How many forms can I create?
It depends on the service plan you are on. Higher service plans enable more features, including more web forms for your account. If you need more forms, go to the My Account section of your account and click the upgrade button. To create an unlimited number of forms, either upgrade to the Platinum service plan or higher. Consult our features matrix for more information.
How can I publish my forms?
You can publish your forms in many ways, by using their direct URL or HTML link, embedding them with a JavaScript code, Inline HTML or iFrame, using the Facebook app or the WordPress plugin, using popups, the Blogger code snippet and many more. Once you have created and customized your form, go to the Publish section to complete your work. Read more in our documentation.
How do I change my form design?
You can change the design of your form in the Themes section, which is located in your form settings. We offer a set of more than 30 predefined form themes for your forms, but you can also create your own from scratch. You can customize the submit button, the logo and more. To apply your own stylesheets, all forms come with a custom CSS editor.

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