Free Embeddable Calculators for Your Website

Add interactive, mobile-friendly calculators to any page with a single line of HTML. No sign-up, no API keys, always free.

One line of code

Paste an iframe tag and you are done. Works in any CMS — WordPress, Webflow, Squarespace, or plain HTML.

Mobile responsive

Widgets are built for every screen size, from 320px phone widths to full desktop layouts.

Always up to date

We maintain the calculators. Your embed automatically reflects any improvements we make.

How to embed a calculator

1Find the calculator you want below and copy its embed code.
2Paste the code into the HTML of your page wherever you want the calculator to appear.
3Optionally adjust the height attribute — use the slider to preview different heights.
4That is it. The calculator loads from CrunchWise and is fully interactive for your visitors.

Attribution: Each widget includes a small "Powered by CrunchWise" link at the bottom. This must remain intact per our terms of use. It opens in a new tab and does not disrupt your visitors.

Compound Interest Calculator

Shows future value, total contributions, and interest earned. Includes Rule of 72 insight and compounding frequency toggle.

View full page

Embed code

<iframe
  src="https://www.crunchwise.org/embed/compound-interest"
  width="100%"
  height="560"
  frameborder="0"
  scrolling="auto"
  title="Compound Interest Calculator by CrunchWise"
  loading="lazy"
></iframe>

Adjust height:560px

Drag to adjust height — the code above updates automatically.

Mortgage Calculator

Calculates the full monthly payment including P&I, property tax, insurance, and PMI. Shows lifetime interest cost.

View full page

Embed code

<iframe
  src="https://www.crunchwise.org/embed/mortgage"
  width="100%"
  height="660"
  frameborder="0"
  scrolling="auto"
  title="Mortgage Calculator by CrunchWise"
  loading="lazy"
></iframe>

Adjust height:660px

Drag to adjust height — the code above updates automatically.

Tip Calculator

Calculates tip amount and splits the bill across multiple people. Includes quick-compare table for 15–25% options.

View full page

Embed code

<iframe
  src="https://www.crunchwise.org/embed/tip"
  width="100%"
  height="580"
  frameborder="0"
  scrolling="auto"
  title="Tip Calculator by CrunchWise"
  loading="lazy"
></iframe>

Adjust height:580px

Drag to adjust height — the code above updates automatically.

Want more calculators? We have 20+ tools covering personal finance, home improvement, and everyday math.

Need a calculator type that is not available yet? Let us know.