Add Lead-Generating Interactive Content to Any Website
One line of embed code. Works on any HTML page, landing page, or custom-built website. No plugins, no dependencies, no framework required.
Get Started FreeLive in 3 simple steps
Copy the embed code
Go to your CalcStack dashboard, choose a calculator, and copy the one-line embed code.
Paste into your HTML
Add the embed code anywhere in your HTML file, landing page template, or CMS custom code section. It works inside any <div>, section, or body tag.
Start capturing leads
The calculator loads instantly. Visitors calculate, see benchmarks, and share their email to save results. Leads arrive in your dashboard.
Why CalcStack for custom websites?
One line of code
A single script tag is all you need. No dependencies, no build step, no framework requirements.
Works everywhere
Static HTML pages, landing page builders, email platforms with custom code, internal tools — if it supports HTML, it supports CalcStack.
Industry benchmarks
Show visitors how they compare to industry averages. Benchmarks increase engagement and lead quality.
White-label ready
Remove all CalcStack branding on Growth and Agency plans. The calculator looks like your own.
Popular Calculators
ROI Calculator
Help prospects calculate return on investment before they buy.
Pricing Calculator
Let visitors configure pricing and see costs in real time.
Break-Even Calculator
Show visitors when their investment will pay for itself.
Profit Margin Calculator
A must-have for e-commerce and SaaS pricing pages.
Mortgage Calculator
Essential for real estate and financial services sites.
Cost Per Lead Calculator
Help marketing teams understand their acquisition costs.
Ready to add calculators to your website?
Start with the Free plan. Copy one line of code, paste it into your HTML, and your calculator is live.
Get Started Free