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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 form fields on your online forms. To create calculations on your form, add an input field such as a Number field or a Price field. This will return the value of your calculation formula. You can also add calculations between the Time and Date fields. The operation between two Time fields, for example, will return the value in number of minutes, while the one between Date fields will return the value in number of days. Go to the SettingsPayments -> Calculations section of your form and select the field in the dropdown list below Assign Values or Formulas to Fields.

form calculations

Select Formulas in Add Values or Formulas. A calculator will appear below where you can add operations between your form fields (Date, Time or numeric input fields). Use the dropdown list within the calculator to add your form fields. Once the field is selected, it will be automatically added in the formula. You can use your keyboard to add operators and values. In the end, press Save on top.

form calculations

Note: You don’t need to enable payments on your form in order to use form calculations. Form fields that have been assigned as formulas cannot be overwritten by form users.

Here’s an example above of an online form that calculates the number of days you have lived:

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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