Free Calculator Widgets for Contractor Websites

Drop a professional concrete, lumber, paint, or rebar calculator into any page with one line of HTML. Self-contained, fast, no signup, and free with attribution.

No signupSelf-contained JSLight & dark themesMobile friendly

1. Concrete Calculator

Slabs, footings, and sonotubes. Outputs cubic yards, 80lb bag count (with waste factor), and cost estimate.

<div id="ta-concrete-calculator"></div>
<script src="https://toolaspect.com/embed/concrete-calculator.js"></script>

Add data-theme="dark" to the div for dark mode.

2. Lumber Calculator

Board feet, linear feet, and piece counts from your project dimensions.

<div id="ta-lumber-calculator"></div>
<script src="https://toolaspect.com/embed/lumber-calculator.js"></script>

3. Paint Calculator

Wall area, doors and windows subtracted, gallons needed with coats and coverage.

<div id="ta-paint-calculator"></div>
<script src="https://toolaspect.com/embed/paint-calculator.js"></script>

4. Rebar Calculator

Rebar count, spacing layout, and total length for slabs and footings.

<div id="ta-rebar-calculator"></div>
<script src="https://toolaspect.com/embed/rebar-calculator.js"></script>

How it works

1. Copy the two lines above for the calculator you want.

2. Paste them anywhere in your page HTML.

3. Done. The widget renders in place, styled to blend with your site (light or dark).

Free tier includes a small "Powered by ToolAspect" attribution link. Want it removed, or need custom branding (your logo, your colors)? Talk to us about white-label embeds.