Embed Calculators on Any Website

Pick a category, pick a calculator, choose a theme. Copy the snippet and paste it into your blog, LMS, marketing site, or newsletter. Free, lightweight, and works anywhere HTML is allowed.

Design your calculator

Pick a calculator, choose a layout and theme. The preview and code update live.

1. Category

2. Calculator (177 in this category)

3. Layout

Compact

Sidebar-friendly. ~360px wide.

Full

Main-content sized. Up to ~720px wide.

4. Theme

Default

Category color in the header and border. Matches the site.

Branded Default

Uses your brand's color instead of the category color.

Minimal

Neutral header and border. Blends into content-heavy pages.

Branded Minimal

Uses your brand's color for the calculate button.

Live preview

This is exactly what visitors will see, rendered from the URL on the right.

Compact · Default

example.com/yourblog

Embed code

Paste this anywhere HTML is allowed. The iframe version is dependency-free; the script version auto-resizes and reports an accurate parent URL for analytics.

embed.html

<iframe  src="https://vastcalc.com/embed/finance/mortgage?layout=compact"  width="100%"  height="640"  frameborder="0"  loading="lazy"  scrolling="no"  title="Mortgage Calculator"  style="max-width:380px;border:0;display:block;"></iframe>

By embedding our calculators you agree to our Acceptable Use Policy.

What You Get

Free for personal, educational, and commercial use.

1,070+ Calculators

Every calculator on VastCalc is embeddable. Math, finance, health, physics, chemistry, construction, conversions, statistics, and everyday tools. Pick whatever fits your content.

Four Themes

Light, dark, minimal, and brand. Brand mode lets you override the accent color so the calculator picks up your site's identity instead of ours.

Two Embed Methods

Drop in a one-line iframe, or use the lightweight JS script for auto-resizing height and accurate analytics. Both work in any blog, LMS, or CMS.

Lightweight

Our embed code is lightweight with fast load times, so your website won't be slowed down by our calculators.

Need Something Custom?

Want a calculator that doesn't exist yet? Need a white-label embed without the VastCalc branding? Building something at scale? Let us know.

Request a calculator