Free Calculator Widgets for Your Website

How it works

Pick a calculator below and copy its code.
Paste the code into your page’s HTML where you want the calculator to appear.
That’s it: the calculator fits your page’s width and grows to its own height.

Each widget runs on our servers, so when a rate or threshold changes (every April in the UK, every January in the US) your page shows the new figures without you doing anything. The widgets carry no ads and set no advertising cookies.

The terms

Free for any website, including charities, schools, councils, advice services and businesses.
Please keep the “Calculator by SumAtlas” line under the widget.
The figures are estimates for guidance, not financial advice. Read how we check our figures.
Want a calculator that isn’t listed, or a different default? Tell us.

UK calculators

UC Earnings Taper Calculator How much UC you lose for every £ you earn.

See the full calculator · Preview the widget

<iframe src="https://sumatlas.com/embed/uk/benefits/universal-credit-taper" title="UC Earnings Taper Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/benefits/universal-credit-taper">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Universal Credit Estimator Estimate your monthly Universal Credit award.

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<iframe src="https://sumatlas.com/embed/uk/benefits/universal-credit" title="Universal Credit Estimator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/benefits/universal-credit">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Local Housing Allowance LHA rates by property size and region.

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<iframe src="https://sumatlas.com/embed/uk/benefits/local-housing-allowance" title="Local Housing Allowance" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/benefits/local-housing-allowance">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Benefit Cap Checker Is your household above the cumulative cap?

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<iframe src="https://sumatlas.com/embed/uk/benefits/benefit-cap" title="Benefit Cap Checker" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/benefits/benefit-cap">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Child Benefit Calculator Weekly Child Benefit by number of children.

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<iframe src="https://sumatlas.com/embed/uk/benefits/child-benefit" title="Child Benefit Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/benefits/child-benefit">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Free Childcare Hours Checker 15 or 30 free hours — eligibility by age and income.

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<iframe src="https://sumatlas.com/embed/uk/benefits/free-childcare-hours" title="Free Childcare Hours Checker" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/benefits/free-childcare-hours">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Maintenance Loan Estimator Support based on household income.

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<iframe src="https://sumatlas.com/embed/uk/students/maintenance-loan" title="Maintenance Loan Estimator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/students/maintenance-loan">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Plan 2 Student Loan Calculator Post-2012 loan repayments.

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<iframe src="https://sumatlas.com/embed/uk/students/plan-2-student-loan" title="Plan 2 Student Loan Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/students/plan-2-student-loan">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Plan 5 Student Loan Calculator Post-2023 loans with the 40-year write-off.

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<iframe src="https://sumatlas.com/embed/uk/students/plan-5-student-loan" title="Plan 5 Student Loan Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/students/plan-5-student-loan">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Pro-Rata Rent Calculator Daily rent for a broken move-in month.

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<iframe src="https://sumatlas.com/embed/uk/life/pro-rata-rent" title="Pro-Rata Rent Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/life/pro-rata-rent">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Single Person Council Tax Discount Apply the 25% solo-occupant rebate.

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<iframe src="https://sumatlas.com/embed/uk/property/single-person-discount" title="Single Person Council Tax Discount" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/property/single-person-discount">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Council Tax Bands Lookup Find your band and typical bill by postcode.

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<iframe src="https://sumatlas.com/embed/uk/property/council-tax-bands" title="Council Tax Bands Lookup" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/property/council-tax-bands">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Premium Bonds Return Expected vs guaranteed savings returns.

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<iframe src="https://sumatlas.com/embed/uk/investing/premium-bonds" title="Premium Bonds Return" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/investing/premium-bonds">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Bonus Tax Calculator See what a one-off bonus is really worth after tax.

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<iframe src="https://sumatlas.com/embed/uk/tax-and-salary/bonus-tax" title="Bonus Tax Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/uk/tax-and-salary/bonus-tax">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

US calculators

Paycheck Calculator Take-home pay after federal tax, Social Security, Medicare and state tax.

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<iframe src="https://sumatlas.com/embed/us/taxes/paycheck-calculator" title="Paycheck Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/us/taxes/paycheck-calculator">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Mortgage Calculator Monthly payment with property tax, insurance, PMI and HOA.

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<iframe src="https://sumatlas.com/embed/us/housing/mortgage-calculator" title="Mortgage Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/us/housing/mortgage-calculator">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Compound Interest Calculator How savings and investments grow with monthly deposits.

See the full calculator · Preview the widget

<iframe src="https://sumatlas.com/embed/us/savings/compound-interest-calculator" title="Compound Interest Calculator" data-sumatlas width="100%" height="900" style="border:0;max-width:760px" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:13px">Calculator by <a href="https://sumatlas.com/us/savings/compound-interest-calculator">SumAtlas</a></p>
<script async src="https://sumatlas.com/embed.js"></script>

Free calculator widgets for your website

How it works

The terms

UK calculators

US calculators