This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

PVB Contact Form 7 Calculator Add-on



With PVB Contact Form 7 Calculator, you can easily turn any Contact Form 7 form into a calculator. Calculated fields are based on user input and selections in other parts of the form. The plugin can be used for creating various types of calculators, such as an ideal weight calculator, calorie calculator, quote calculator for hotel booking, car rental quote calculator, mortgage calculator, tax calculator, finance calculators, date calculator, etc.


  • Advanced calculations – set your custom formula based on user input, for example:
    cost_per_day * days * (1 + (tax_percentage / 100))
  • Hide calculated fields – they can be visible to the user or not. Your choice!
  • Server-side calculation – you don’t have to disclose your top secret formula! Calculations are performed behind the scenes, on the server.
  • Calculate on button click – you can let your users trigger the calculations without submitting the form.
  • Calculate on submit – values are always calculated on submit, so you can use them in your notification emails.
  • Calculate on other events – you can also trigger calculations from another script at any time!
  • Correct floating-point math – PVB Contact Form 7 Calculator Pro handles decimal floating-point math properly, unlike many online calculators that introduce rounding errors when converting to binary and back, yielding incorrect results (such as 0.6 + 0.3 = 0.8999).
  • Multiple calculated fields (Pro version only) – you can have as many as you like in the same form!
  • Intermediate calculation steps (Pro version only) – calculated fields can be based on other calculated fields. They are evaluated in order, from top to bottom.
  • Assign numeric values to text fields (Pro version only) – for example, you can assign a specific price to each choice in a drop-down menu.
  • PayPal and Stripe integration (Pro version only) – accept payments from your website visitors based on the calculated amount
  • Currency conversion (Pro version only) – use up-to-date currency exchange rates in your formulas.
  • Custom PHP code (Pro version only) – the calculator is not advanced enough for you? Now you can run any PHP code in your calculation formulas. For security reasons, this feature is disabled by default and you must explicitly enable it from the Options page.
  • Reference external spreadsheets (Pro version only) – need to update your price list frequently? The calculator can look up data from an online spreadsheet in various formats (Google Sheets, Excel, CSV…)
  • Calculate travel distance and time (Pro version only) – integration with Google Maps API allows you to work with addresses and locations.

Live demo

We have prepared a Live Demo to let you test the capabilities of PVB Contact Form 7 Calculator.

Video tutorial

Pro version

If you like PVB Contact Form 7 Calculator, please consider upgrading to our Pro version. It lets you have multiple calculated fields per form, calculations based on text values (such as drop-down menus), integrate your calculator with PayPal, Stripe and Google Sheets, and other great features scheduled for future releases.

WP Admin Notices

This plugin generates an Admin Notice in the WP Admin dashboard. It will invite you to rate our plugin or consider upgrading to the Pro version. These notices may annoy or confuse certain users, but are appreciated by the majority of our userbase, who understand that these notices support our free contributions to the WordPress community.

If you feel that these notices are too annoying, then we encourage you to consider our Pro version, or even consider developing your own plugins for WordPress, if supporting free plugin authors is too frustrating for you. A final alternative would be to place the defined constant mentioned below inside of your wp-config.php file to manually hide this plugin’s nag notices:

define('DISABLE_NAG_NOTICES', true);

Note: This defined constant will only affect the notices mentioned above, and will not affect any other notices generated by this plugin, such as one-time notices that communicate with admin-level users.


  • Loan calculator
  • Booking calculator
  • Ideal weight calculator


Contact Form 7 5.0 or later is required.

  1. Download the plugin zip file to your computer;
  2. Unzip the file;
  3. Upload the pvb-contact-form-7-calculator directory to your /wp-content/plugins/ directory.
  4. Activate the plugin from the “Plugins” menu in WordPress.
  5. Refer to the plugin documentation.


Can I accept payments with PVB Contact Form 7 Calculator?

Simple PayPal and Stripe integration is available in the Pro version. The plugin can generate a Pay Now button on the fly when a calculation is made.

Can I use PVB Contact Form 7 Calculator for currency conversion?

Yes, you can! A currency conversion function is available in the Pro version.

As an alternative, you can use the “wpcf7calculate” jQuery event to trigger currency conversion or other post-processing operations after a calculation. You can code your own Javascript function and place it somewhere on your website to call a third-party currency conversion API. Here is an example:

jQuery(function($) {
      $('form').on('wpcf7calculate', function() { 
        var dollars = jQuery('input[name=total]').val();
        var euro = currencyConvert(dollars, 'USD', 'EUR');
        if (euro === false) {
            alert('Currency conversion failed');
        } else {
            alert(dollars + ' dollars = ' + euro.toFixed(2) + ' euro');

function currencyConvert(amount, from, to) {
    var result = '';
    var convertUrl = "" + from + "_" + to + "&compact=ultra";
    var rate = false;
        url: convertUrl,
        async: false,
        type: "GET",
        dataType: "json",
        success: function (data) {
            rate = data[from + "_" + to];
    return rate ? parseFloat(amount) * parseFloat(rate) : false;

Can I use PVB Contact Form 7 Calculator to calculate distance and travel time?

Yes, this is available in the Pro version. This feature requires that you have a valid Google Places API key.

Can I reference a list of values in a spreadsheet when configuring my calculation formula?

This is available in the Pro version. Please refer to the plugin documentation for more information about support for external spreadsheets.

How does the calculator handle multiple checkbox groups?

If more than one checkbox is selected in the same group, the values will be summed. To avoid the possibility to select more than one checkbox at the same time, use the “exclusive” modifier in the checkbox tag, or use radio buttons instead. More information and examples are available in the plugin documentation.


སྤྱི་ཟླ་བཅུ་པ། 23, 2023
This plugin turned Contact Form 7 from useful to powerful. Thanks go out to Petko for the brilliant support as well. The support for PVB Contact Form 7 Calculator Add-on is incredible. I can’t thank you enough Petko for all of the help!
སྤྱི་ཟླ་གསུམ་པ། 20, 2021
Don’t download another one, this is the best simple/efficient one. Now just two words : Thank You. (no problem with the latest version of WP)
སྤྱི་ཟླ་བརྒྱད་པ། 28, 2020
Hi, I use this plugin for a mont. I’m really amazing usefulness the function. Wery usability plugin. Thanks for PVB Calculator. Regards Mateusz
སྤྱི་ཟླ་ལྔ་པ། 1, 2020
I use this add-on for Contact Form 7 in order to calculate fields of online sales certificate and it works very well. If you want advanced features (multiple calculated fields, intermediate variables…), then you will need the PRO version. But the investment is well worth the cost 😉
སྤྱི་ཟླ་གཉིས་པ། 19, 2020
I am very happy with this great plugin. I purchased the pro version and Petko helped me a lot with his quick responsiveness, creative mindset, amazing cooperation by explaining some functionalities. All in all I would recommend @pbosakov for this excellent plugin!
སྤྱི་ཟླ་དང་པ། 13, 2020
The plugin is easy to use and the pro version allows you to make multiple calculated tags. It is a great addition to Contact Form 7. I’m using the pro version to calculate payment information for the customer along with the integrated Stripe checkout. Although the email and attached files are sent before checkout, there are separate redirect pages where the customer may be sent after successful or unsuccessful payment.
Read all 10 reviews

Contributors & Developers

“PVB Contact Form 7 Calculator Add-on” is open source software. The following people have contributed to this plugin.


“PVB Contact Form 7 Calculator Add-on” has been translated into 3 locales. Thank you to the translators for their contributions.

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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Fix: PHP 8 fatal error
  • Fix: Calculate button shortcode issues
  • Code formatting and documentation updates
  • Tested for compatibility with WordPress 6.3


  • Fix: error when adding negative numbers
  • Fix: calculation field names with uppercase letters do not work properly
  • Fix: WordPress warning related to add_submenu_page function parameters
  • Fix: Calculate button not working with some themes


  • Fix: fatal error when attempting to activate both free and premium versions of the plugin at the same time


  • Fix: division bug


  • Fix: multiple guidelines and security fixes


  • Update: better user control over admin notifications


  • Fix: incorrect handling of non-integer exponents


  • Fix: avoid interfering with CF7 style sheets


  • Fix: cf7-hide option not working with some themes


  • Fix: rounding results to a whole number not working


  • Fix: groups of multiple checkboxes not supported


  • initial release