Free calculators for your website

Put any of these UK calculators on your own site or blog for free. Copy the snippet, paste it into your page's HTML, and it resizes itself to fit. Nothing your visitors type is sent anywhere: the sums run in their browser.

Each snippet includes a small "Powered by BillMyWeek" link. Please keep it in place. You can preview any calculator first. Figures are estimates, not tax or legal advice, and each embed says so.

CIS deduction and take-home calculator

Guidance only, not tax advice. Based on GOV.UK Construction Industry Scheme rules. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/cis-calculator" title="CIS deduction and take-home calculator by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/cis-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Etsy fee and profit calculator (UK)

Estimate only. Based on Etsy's published UK fees, checked 19 October 2026. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/etsy-fee-calculator" title="Etsy fee and profit calculator (UK) by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/etsy-fee-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Side hustle tax calculator (UK 2026/27)

Estimate only, not tax advice. Based on GOV.UK 2026/27 rates. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/side-hustle-tax-calculator" title="Side hustle tax calculator (UK 2026/27) by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/side-hustle-tax-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Overtime pay calculator

Overtime depends on what you have agreed in your contract. Amounts are before tax. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/overtime-calculator" title="Overtime pay calculator by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/overtime-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Day rate calculator

Figures are before tax. Rounded to the penny per line. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/day-rate-calculator" title="Day rate calculator by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/day-rate-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Late payment interest calculator (UK)

Estimate only, not legal advice. For business-to-business debts under the Late Payment of Commercial Debts (Interest) Act 1998. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/late-payment-interest-calculator" title="Late payment interest calculator (UK) by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/late-payment-interest-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Holiday pay calculator

Estimate only. Check your contract and GOV.UK holiday entitlement rules. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/holiday-pay-calculator" title="Holiday pay calculator by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/holiday-pay-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Markup and margin calculator

Prices are before VAT unless you include it. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/markup-and-margin-calculator" title="Markup and margin calculator by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/markup-and-margin-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

Self-employed tax calculator (UK 2026/27)

Estimate only, not tax advice. Based on GOV.UK 2026/27 rates for England, Wales and Northern Ireland. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/self-employed-tax-calculator" title="Self-employed tax calculator (UK 2026/27) by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/self-employed-tax-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

January tax bill calculator (2025/26 return)

Estimate only, not tax advice. Based on GOV.UK 2025/26 rates for England, Wales and Northern Ireland. Preview · Full calculator and guide

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<iframe src="https://billmyweek.com/embed/january-tax-bill-calculator" title="January tax bill calculator (2025/26 return) by BillMyWeek" width="100%" height="800" loading="lazy" style="border:0;max-width:680px"></iframe>
<p style="font-size:13px;margin:4px 0">Powered by <a href="https://billmyweek.com/january-tax-bill-calculator">BillMyWeek</a></p>
<script>addEventListener("message",function(e){if(e.origin!=="https://billmyweek.com"||!e.data||e.data.type!=="bmw-embed-height")return;var f=document.querySelectorAll('iframe[src="https://billmyweek.com/embed/'+e.data.slug+'"]');for(var i=0;i<f.length;i++)f[i].style.height=(e.data.height+24)+"px"});</script>

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