Working with agencies, I noticed they all have the same problem: explaining ROI to clients is hard. Most calculators out there are either ugly or require heavy plugins.
I decided to build a minimalist, high-converting ROI Calculator using only Vanilla web tech. No React, no jQuery, just clean code.
The Tech Behind It
- Vanilla JS: Handles the logic for the 4 sliders (Ad Spend, CPC, Conversion, and Sale Value).
- CSS Variables: To make the UI easy to customize.
- Responsive Design: It works perfectly on mobile and desktop.
Why Vanilla?
Performance is key for landing pages. This widget loads instantly and doesn't bloat your site. It’s a single file you can drop into any project.
Want the source code?
I've spent hours polishing the UI and commenting the code so anyone can use it. If you want to save yourself the dev time and add this to your client sites today, you can grab the full source code here:
Get the ROI Calculator on Gumroad:
https://albertpuig.gumroad.com/l/vumuqb
I’m curious —do you use calculators on your landing pages to boost conversion? Let me know in the comments!
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