Free calculator widgets for your website

Add a FlareLodge calculator to your own site, blog or class page. The widgets are free, carry no ads, store nothing your visitors type, and use the same tested formulas as our full calculators. Copy the code under a widget and paste it into an HTML block (WordPress "Custom HTML", Squarespace "Code", Wix "Embed code").

Terms: free for any site, including commercial ones. Please keep the "Calculator by FlareLodge" line under the widget. The small script after it only resizes the frame to fit; the widget still works if your site removes it.

Mortgage Payment Calculator

See the full monthly cost of a home loan: principal and interest plus the escrow items most lenders collect with it. Open the full mortgage payment calculator for the formula, sources and worked examples.

Embed code

<iframe src="https://flarelodge.com/embed/mortgage-payment-calculator/" title="Mortgage Payment Calculator" width="100%" height="980" style="border:0;max-width:960px" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:4px 0 0"><a href="https://flarelodge.com/" rel="nofollow">Calculator by FlareLodge</a></p>
<script>addEventListener("message",function(e){var d=e.data;if(e.origin==="https://flarelodge.com"&&d&&d.flarelodge==="height"){document.querySelectorAll('iframe[src^="https://flarelodge.com'+d.path+'"]').forEach(function(f){f.style.height=d.height+"px"})}})</script>

BMI Calculator

Body mass index compares weight with height. Enter yours to see your BMI, its CDC category and the weight range that counts as healthy for your height. Open the full bmi calculator for the formula, sources and worked examples.

Embed code

<iframe src="https://flarelodge.com/embed/bmi-calculator/" title="BMI Calculator" width="100%" height="760" style="border:0;max-width:960px" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:4px 0 0"><a href="https://flarelodge.com/" rel="nofollow">Calculator by FlareLodge</a></p>
<script>addEventListener("message",function(e){var d=e.data;if(e.origin==="https://flarelodge.com"&&d&&d.flarelodge==="height"){document.querySelectorAll('iframe[src^="https://flarelodge.com'+d.path+'"]').forEach(function(f){f.style.height=d.height+"px"})}})</script>

Percentage Calculator

Three everyday percentage questions in one tool, each with the arithmetic written out. Open the full percentage calculator for the formula, sources and worked examples.

Embed code

<iframe src="https://flarelodge.com/embed/percentage-calculator/" title="Percentage Calculator" width="100%" height="640" style="border:0;max-width:960px" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:4px 0 0"><a href="https://flarelodge.com/" rel="nofollow">Calculator by FlareLodge</a></p>
<script>addEventListener("message",function(e){var d=e.data;if(e.origin==="https://flarelodge.com"&&d&&d.flarelodge==="height"){document.querySelectorAll('iframe[src^="https://flarelodge.com'+d.path+'"]').forEach(function(f){f.style.height=d.height+"px"})}})</script>

Questions

Does it slow my page down? The frame loads lazily, only when a visitor scrolls near it, and runs entirely in their browser.

Can I change the default numbers? Yes. Add them to the address, for example https://flarelodge.com/embed/bmi-calculator/?unitSystem=metric&heightCm=170&weightKg=70. The field names match the share links on our calculator pages.

Want another calculator as a widget? Tell us which one.