Calculated Fields Form is a plugin for creating forms with dynamically calculated fields and display the result.
ez Form Calculator is a WordPress premium form-generating plugin. You can simply create a form calculator for both yourself and your customers.
WP App Studio is a Professional WordPress Plugin Development Platform for building custom post types, fields, taxonomies, widgets, forms, notification
Simple Price Calculator is a WordPress plugin that allows you to create your own price calculation form. You can use it to provide instant price quote
WooPrice Calculator, the extension to give a price of product according to its characteristics with mathematical formulas.
Image Price Calculator is a WordPress plugin that allows you to create your own price calculation form.