Contact Form 7 is one of the most popular contact form plugins with millions of active installations. There are also plenty of extensions available for it that let you do more. Here are 3 CF7 extensions that can handle calculations:
PVB Contact Form 7 Calculator: turns any Contact Form 7 into a calculator. It can be used to create weight, booking, rental, mortgage, tax, and other calculations. Your formula is safe with server side calculations.
Contact Form 7 Cost Calculator: a handy plugin that lets you create price estimate forms. Lets you create forms with dynamically calculated fields. You can add checkbox and radio box fields to your calculators.
Calculate Contact Form 7: a handy plugin that lets you use Contact Form 7 for booking, loan, and general math calculations. It also has a convenient range slider and works with PayPal. The pro version has even more features.
Have you found better Contact Form 7 calculator plugins? Please share them here.