Put these on your own site

Add any calculator to your website with one line of HTML. Free to use, no credit line needed, and no tracking of your visitors.

What you get

A see-through card that takes your page background. No white box.
Automatic height, so the frame never cuts off or shows its own scrollbar.
Works down to 320px wide, for readers on a phone.
No cookies, no analytics, and nothing your visitors type is sent anywhere.

Loyalty Card Calculator: How Many Stamps?

The real discount hiding in a stamp card.

<iframe src="https://kanjin.app/embed/loyalty-reward-calculator" width="100%" height="620" style="border:0" loading="lazy" title="Loyalty Card Calculator: How Many Stamps?"></iframe>
<p><a href="https://kanjin.app/tools/loyalty-reward-calculator">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/loyalty-reward-calculator

Customer Lifetime Value Calculator for Small Shops

What one regular is worth, and what losing them costs.

<iframe src="https://kanjin.app/embed/customer-value-calculator" width="100%" height="620" style="border:0" loading="lazy" title="Customer Lifetime Value Calculator for Small Shops"></iframe>
<p><a href="https://kanjin.app/tools/customer-value-calculator">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/customer-value-calculator

Email Marketing ROI Calculator for Small Shops

What an email earns, after the customers who were coming anyway.

<iframe src="https://kanjin.app/embed/email-roi-calculator" width="100%" height="620" style="border:0" loading="lazy" title="Email Marketing ROI Calculator for Small Shops"></iframe>
<p><a href="https://kanjin.app/tools/email-roi-calculator">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/email-roi-calculator

Restaurant Break-Even Calculator

Customers per day needed to cover your costs.

<iframe src="https://kanjin.app/embed/break-even" width="100%" height="620" style="border:0" loading="lazy" title="Restaurant Break-Even Calculator"></iframe>
<p><a href="https://kanjin.app/tools/break-even">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/break-even

Discount ROI Calculator

What a discount costs against a few free visits.

<iframe src="https://kanjin.app/embed/discount-roi" width="100%" height="620" style="border:0" loading="lazy" title="Discount ROI Calculator"></iframe>
<p><a href="https://kanjin.app/tools/discount-roi">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/discount-roi

Menu Engineering Matrix Calculator

See which menu items earn money and which just sell.

<iframe src="https://kanjin.app/embed/menu-engineering-calculator" width="100%" height="620" style="border:0" loading="lazy" title="Menu Engineering Matrix Calculator"></iframe>
<p><a href="https://kanjin.app/tools/menu-engineering-calculator">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/menu-engineering-calculator

Restaurant Capacity Calculator

How full you are, and what empty seats cost.

<iframe src="https://kanjin.app/embed/capacity" width="100%" height="620" style="border:0" loading="lazy" title="Restaurant Capacity Calculator"></iframe>
<p><a href="https://kanjin.app/tools/capacity">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/capacity

Google Review Calculator

5-star reviews needed to reach your target rating.

<iframe src="https://kanjin.app/embed/google-review-calculator" width="100%" height="620" style="border:0" loading="lazy" title="Google Review Calculator"></iframe>
<p><a href="https://kanjin.app/tools/google-review-calculator">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/google-review-calculator

Booth Rent vs Commission Calculator

Rent, commission or a wage: what one chair is worth a month.

<iframe src="https://kanjin.app/embed/booth-rent" width="100%" height="620" style="border:0" loading="lazy" title="Booth Rent vs Commission Calculator"></iframe>
<p><a href="https://kanjin.app/tools/booth-rent">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/booth-rent

Google Review QR Code Maker

Print a counter card with your Google review QR code.

<iframe src="https://kanjin.app/embed/review-qr-card" width="100%" height="620" style="border:0" loading="lazy" title="Google Review QR Code Maker"></iframe>
<p><a href="https://kanjin.app/tools/review-qr-card">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/review-qr-card

Printable Stamp Card Maker

Print paper stamp cards and a matching counter poster.

<iframe src="https://kanjin.app/embed/stamp-card-maker" width="100%" height="620" style="border:0" loading="lazy" title="Printable Stamp Card Maker"></iframe>
<p><a href="https://kanjin.app/tools/stamp-card-maker">Calculator by KANJIN</a></p>

The line under the calculator is a plain link back to this page. It is optional: keep it if you like, delete it if you don’t. Nothing inside the frame changes either way.

See it at /tools/stamp-card-maker

Making the height automatic

The height above is a good starting value. Each widget also sends its real height to your page whenever its content changes, for example when a chart appears or a row is added. Add this script and the frame resizes itself:

window.addEventListener('message', (event) => {
  if (event.data?.type !== 'loop-tools:height') return;
  const frame = document.querySelector(
    'iframe[src*="' + event.data.path + '"]'
  );
  if (frame) frame.style.height = event.data.height + 'px';
});

If your page handles other postMessage traffic, check the origin before you trust the message. The message carries only a height and a path, never anything a visitor typed.