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Free calculator widgets for your website

Running a UK money blog, an estate agent or letting site, a builders' merchant or a motoring site? Put any of our calculators on your own page so your readers get exact answers without leaving. It is free, it has no ads inside, and it works on phones.

How to add a calculator

Pick a calculator below and click Copy code.
Paste the code into your page. In WordPress, use a Custom HTML block. In Squarespace, Wix or Webflow, use an Embed or Code block.
Publish. The calculator adjusts its height automatically. If your site strips scripts, it still works at a fixed height.

The only thing we ask is that you keep the small credit line under the calculator. The math always runs in your reader's browser and nothing they type is sent anywhere. Want a calculator we do not have, or a different color? Tell us.

Take Home Pay Calculator (2026/27)

Salary after Income Tax, National Insurance and pension, per year, month and week. See it live.

<iframe src="https://homemathcalc.co.uk/embed/take-home-pay-calculator/" title="Take Home Pay Calculator (2026/27)" width="100%" height="900" loading="lazy" style="border:0;max-width:720px;width:100%"></iframe>
<p style="font-size:13px">Take Home Pay Calculator (2026/27) by <a href="https://homemathcalc.co.uk/take-home-pay-calculator/">HomeMathCalc</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://homemathcalc.co.uk"||!e.data||!e.data.hmcH)return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++)if(f[i].contentWindow===e.source)f[i].style.height=e.data.hmcH+"px"})</script>

Stamp Duty Calculator (England and Northern Ireland)

Stamp Duty Land Tax for home movers, first-time buyers and additional properties. See it live.

<iframe src="https://homemathcalc.co.uk/embed/stamp-duty-calculator/" title="Stamp Duty Calculator (England and Northern Ireland)" width="100%" height="900" loading="lazy" style="border:0;max-width:720px;width:100%"></iframe>
<p style="font-size:13px">Stamp Duty Calculator (England and Northern Ireland) by <a href="https://homemathcalc.co.uk/stamp-duty-calculator/">HomeMathCalc</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://homemathcalc.co.uk"||!e.data||!e.data.hmcH)return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++)if(f[i].contentWindow===e.source)f[i].style.height=e.data.hmcH+"px"})</script>

Statutory Redundancy Pay Calculator

Statutory redundancy pay from your age, years of service and weekly pay. See it live.

<iframe src="https://homemathcalc.co.uk/embed/redundancy-pay-calculator/" title="Statutory Redundancy Pay Calculator" width="100%" height="900" loading="lazy" style="border:0;max-width:720px;width:100%"></iframe>
<p style="font-size:13px">Statutory Redundancy Pay Calculator by <a href="https://homemathcalc.co.uk/redundancy-pay-calculator/">HomeMathCalc</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://homemathcalc.co.uk"||!e.data||!e.data.hmcH)return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++)if(f[i].contentWindow===e.source)f[i].style.height=e.data.hmcH+"px"})</script>

Concrete Calculator (m³ and bags)

Cubic metres, tonnes and 25 kg bags for slabs, footings and post holes. See it live.

<iframe src="https://homemathcalc.co.uk/embed/concrete-calculator/" title="Concrete Calculator (m³ and bags)" width="100%" height="850" loading="lazy" style="border:0;max-width:720px;width:100%"></iframe>
<p style="font-size:13px">Concrete Calculator (m³ and bags) by <a href="https://homemathcalc.co.uk/concrete-calculator/">HomeMathCalc</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://homemathcalc.co.uk"||!e.data||!e.data.hmcH)return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++)if(f[i].contentWindow===e.source)f[i].style.height=e.data.hmcH+"px"})</script>

Electricity Cost Calculator (UK)

Running cost of any appliance per hour, day, month and year at your pence per kWh. See it live.

<iframe src="https://homemathcalc.co.uk/embed/electricity-cost-calculator/" title="Electricity Cost Calculator (UK)" width="100%" height="790" loading="lazy" style="border:0;max-width:720px;width:100%"></iframe>
<p style="font-size:13px">Electricity Cost Calculator (UK) by <a href="https://homemathcalc.co.uk/electricity-cost-calculator/">HomeMathCalc</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://homemathcalc.co.uk"||!e.data||!e.data.hmcH)return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++)if(f[i].contentWindow===e.source)f[i].style.height=e.data.hmcH+"px"})</script>

Fuel Cost Calculator (UK)

Journey fuel cost from miles, UK mpg and pence per litre, split between passengers. See it live.

<iframe src="https://homemathcalc.co.uk/embed/fuel-cost-calculator/" title="Fuel Cost Calculator (UK)" width="100%" height="900" loading="lazy" style="border:0;max-width:720px;width:100%"></iframe>
<p style="font-size:13px">Fuel Cost Calculator (UK) by <a href="https://homemathcalc.co.uk/fuel-cost-calculator/">HomeMathCalc</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://homemathcalc.co.uk"||!e.data||!e.data.hmcH)return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++)if(f[i].contentWindow===e.source)f[i].style.height=e.data.hmcH+"px"})</script>