How to Build a Project Cost Estimator on Wix Using Velo

🎯 Introduction

Every agency or freelancer working on Wix websites knows how time-consuming it can be to manually qualify leads. Clients often ask for price estimates before even sharing project details. A project cost estimator built directly into your Wix site can solve this problem. It helps visitors get an instant idea of project costs and delivery times, saving you hours of back-and-forth communication. This tool not only improves user experience but also filters serious inquiries, so you focus on leads ready to move forward.

If you want to add a Wix project estimator that is interactive, easy to use, and requires no external APIs, this guide is for you. Let’s build a cost estimator using Wix Velo that shows price ranges and delivery days dynamically.

🛠️ What You Will Build

You will create an interactive cost estimator where clients select the services they want via checkboxes. The estimator will instantly calculate and display:

• A price range based on minimum and maximum costs of selected services

• The maximum delivery days needed (assuming parallel work)

• All updates happen without page reloads or external API calls

  
  

This simple calculator improves user engagement and helps clients understand your pricing upfront.

✅ Prerequisites

Before starting, make sure you have:

• Wix Dev Mode enabled on your site to access Velo coding features

• Basic knowledge of JavaScript and Wix Velo APIs

• A Wix page with checkboxes for each service and text elements to show results

  
  
  
  

📦 Step 1 — Plan Services and Prices

Start by listing your services with their price ranges and delivery times. For example:

| Service | Min Price (₹) | Max Price (₹) | Delivery Days |

|-------------------|---------------|---------------|---------------|

| API Integration | 15,000 | 25,000 | 3 |

| Payment Gateway | 20,000 | 35,000 | 5 |

| AI Chatbot | 18,000 | 30,000 | 4 |

This table will guide your code logic. You can add more services or adjust prices as needed.

💻 Step 2 — Velo Code Logic

Create a services array in your Velo backend or page code that holds service details:

```js

const services = [

{ id: "apiIntegration", minPrice: 15000, maxPrice: 25000, days: 3 },

{ id: "paymentGateway", minPrice: 20000, maxPrice: 35000, days: 5 },

{ id: "aiChatbot", minPrice: 18000, maxPrice: 30000, days: 4 }

];

```

For each checkbox, add an `onChange` event handler. When a user selects or deselects a service:

• Loop through all checkboxes to find checked ones

• Sum the minPrice and maxPrice of selected services

• Use `Math.max` to find the longest delivery time among selected services (assuming parallel work)

• Update the display elements with formatted prices and days

  
  

Example snippet for summing and updating:

```js

$w.onReady(() => {

$w("#apiIntegration, #paymentGateway, #aiChatbot").onChange(() => {

let minTotal = 0;

let maxTotal = 0;

let maxDays = 0;

services.forEach(service => {

if ($w(`#${service.id}`).checked) {

minTotal += service.minPrice;

maxTotal += service.maxPrice;

maxDays = Math.max(maxDays, service.days);

}

});

$w("#priceRange").text = `₹${minTotal.toLocaleString()} to ₹${maxTotal.toLocaleString()}`;

$w("#deliveryTime").text = `${maxDays} working days`;

});

});

```

🎨 Step 3 — Format Results

Display the results clearly:

• Show price as a range: ₹15,000 to ₹40,000

• Show delivery as: 3-5 working days (if you want to show a range, sum min and max days accordingly)

• Add an animated count-up effect on number changes to improve user experience

  
  

You can use simple JavaScript animation libraries or Wix’s built-in animation features to animate the numbers.

Interactive Wix project cost estimator interface

🐛 Common Issues

| Issue | Cause | Solution |

|-------------------------------|---------------------------------------|--------------------------------------------|

| Checkbox value not updating | Using `.value` instead of `.checked` | Use `.checked` property to get checkbox state |

| Delivery days added incorrectly| Adding days instead of using max | Use `Math.max` to find max delivery days |

| Event not firing on checkbox | Missing `onChange` on each checkbox | Attach `onChange` event to every checkbox |

| Quote button visibility wrong | No logic to show/hide based on selection | Show button only if at least one checkbox is checked |

💡 Pro Tips

• Add an urgency multiplier to increase prices for faster delivery options

• Use Wix Forms to email the estimate directly to clients

• Show a breakdown of selected services with individual prices for transparency

• Animate number changes with libraries like CountUp.js for a polished look

  
  
  
  

🚀 Conclusion

Building a Wix Velo cost calculator helps you save time and qualify leads automatically. This interactive estimator improves client experience by providing instant price ranges and delivery times without page reloads or external APIs.

If you want a custom-built estimator tailored to your services, contact WixCrafters. Our team specializes in Wix Velo development and can create powerful tools to grow your business.

Visit wixcrafters.com or email us at wixcrafters@gmail.com. We also have a 5-star rating on Fiverr for quality Wix projects.