uCoz

This plug-in provides an opportunity to automatically integrate calculator. This way you don’t need to place the code manually, all you need to do is authorize access from the uCalc account and choose an already made calculator from the list.
<a href="https://ucalc.pro" rel="nofollow ugc">uCalc</a> is a service that helps you create and maintain calculators to estimate services and delivery costs as well as build booking, review, feedback, and event registration forms. No special knowledge and operational fees are required. You can create a calculator by just dragging the blocks and putting together simple formulas like A+B=C. You are provided with the embed code that needs to be added to a website powered by any platform. The built-in calculator is edited through the service.
The builder has the following benefits:
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Ready-to-use templates and a collection of elements: a slider, button, drop-down list, checkmarks, contacts collection, date picker, etc.
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Completed orders notifications are sent to the owner or manager of the website via email or SMS
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Results with the opportunity to apply a promo code are sent to clients via email or SMS
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Design customization: background and text colors, fonts and color customization of the elements
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Display of several results, for example, with and without a discount
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Recognition of any currency and measure (weight, size, volume, product unit)
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Option to illustrate every element
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Widgets on the website automatically adapt for smartphones and tablets
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Check out the video to learn how to add a calculator with the help of the plugin: 
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/m_Usz8NP_RU?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

uCalc

Create a costs calculator by simply dragging blocks, adding pictures and texts. It takes only 10 minutes, $0, and no special knowledge!

pbosakov

<h4>Overview</h4>
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.
<h4>Features</h4>
<ul>
<li>Advanced calculations – set your custom formula based on user input, for example: 
 cost_per_day * days * (1 + (tax_percentage / 100))</li>
<li>Hide calculated fields – they can be visible to the user or not. Your choice!</li>
<li>Server-side calculation – you don’t have to disclose your top secret formula! Calculations are performed behind the scenes, on the server.</li>
<li>Calculate on button click – you can let your users trigger the calculations without submitting the form.</li>
<li>Calculate on submit – values are always calculated on submit, so you can use them in your notification emails.</li>
<li>Calculate on other events – you can also trigger calculations from another script at any time!</li>
<li>Correct floating-point math – PVB Contact Form 7 Calculator 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).</li>
</ul>
<h4>Video tutorial</h4>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/1A2e60_DcZ4?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

PVB Contact Form 7 Calculator

Lets you easily turn any Contact Form 7 form into a quote or price estimate calculator.

uCalc vs PVB Contact Form 7 Calculator