Generic selectors
Exact matches only
Search in title
Search in content

Form Calculations in Order Forms on 123FormBuilder

With 123FormBuilder, 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, 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 Price from Payment & Calculations section.

Add a price

Next to each option type in their correspondent price.

Assign price

After saving the prices, this is how it would look like. By default, the prices are shown on form, but you can disable that by toggling off Show prices on form.

If you need the user to type in a custom amount, add a Number field and assign the price “1”. By default, a field has no value assigned to it, meaning the input will be multiplied by zero.

number price

By assigning a value, 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).

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

Quantity field

Create formulas

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

Add a Formula field from the Specific fields section. 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

Important Notes

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

6 comments

  1. If I have a limited supply, such as 100 Widgets, how do I prevent more than 100 items from being sold? Where can I set the product limit?

Leave a Reply

Your email address will not be published. Required fields are marked *

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 for more information. 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.

Can't find what you're looking for?