WordPress.org

"price-calc" is a WordPress plug-in that shows a nice inter-active price calculator form on any post, page or widget content. Let your customers view automatic bids and cost estimates for your products and services. You can set up a set of product variations and freely define a price structure. Once configured, it's as easy as placing the simple [price-calc] mark-up anywhere in your text. The user gets a nice interactive form to choose all the characteristics he needs. When he's ready he can see the quote instantly on the screen, print it out or get it by email.

PLEASE NOTE: There will not be any further development of this software. It will be replaced by Jazzy Forms.

Features are:

• AJAX user-experience,
• different options for each general product type,
• a fully configurable price structure,
• instant price calculations appears on screen while the user fills in the form,
• displays a detailed cost estimate on screen,
• optional printer-friendly window pop-up,
• optional email delivery to customer and/or your company.
• user-defined calculation formula with addition, multiplication and percentages
• customizable quote structure with intermediate results

Requirements:

• PHP 5.2 or greater
• WP 2.8 or greater

More info at this plugin’s homepage