Free UK calculators for your website

How it works

• Free, no sign-up. Copy the code under a calculator and paste it into an HTML, "Custom HTML" or embed block (WordPress, Squarespace, Wix, Ghost and most site builders have one).
• Private. The calculators run in your reader's browser. Nothing they type is stored or sent anywhere, and there are no ads or tracking cookies.
• Responsive. The calculator fills the width of your column (up to 760px) and has a fixed height; on narrow phones it scrolls inside the frame.
• Kept current. When rates change on GOV.UK we update the calculator, and your embed updates with it.
• One condition: please keep the short credit link under the calculator.

£1,000 trading allowance calculator

Side hustlers enter their income and expenses to see whether the £1,000 trading allowance or actual expenses gives the lower taxable profit, and whether they need to register for Self Assessment. Great for posts on selling online, reselling and small side jobs. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/trading-allowance-calculator?embed=1" title="£1,000 trading allowance calculator by Tidy Sheets" width="100%" height="660" style="width:100%;max-width:760px;height:660px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/trading-allowance-calculator">£1,000 trading allowance calculator</a> by Tidy Sheets</p> Copy code

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£1,000 trading allowance calculator by Tidy Sheets

HMRC mileage allowance calculator

Works out a simplified mileage claim at 55p then 25p a mile for 2026-27 (24p for motorcycles), with 2025-26 rates too and the 10,000-mile split. Ideal for self-employed, driving and delivery-work articles. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/mileage-allowance-calculator?embed=1" title="HMRC mileage allowance calculator by Tidy Sheets" width="100%" height="600" style="width:100%;max-width:760px;height:600px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/mileage-allowance-calculator">HMRC mileage allowance calculator</a> by Tidy Sheets</p> Copy code

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HMRC mileage allowance calculator by Tidy Sheets

Tax-Free Childcare calculator

Parents enter monthly childcare bills for up to 3 children to see the 20% top-up, the £500 (or £1,000) 3-month cap and yearly totals, plus an earnings and £100,000 eligibility check. Fits parenting, nursery-cost and family budgeting content. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/tax-free-childcare-calculator?embed=1" title="Tax-Free Childcare calculator by Tidy Sheets" width="100%" height="1700" style="width:100%;max-width:760px;height:1700px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/tax-free-childcare-calculator">Tax-Free Childcare calculator</a> by Tidy Sheets</p> Copy code

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Tax-Free Childcare calculator by Tidy Sheets

High Income Child Benefit Charge calculator

Estimates adjusted net income, the Child Benefit charge between £60,000 and £80,000, and how much a pension or Gift Aid payment would cut it. Useful for payroll, pensions and higher-rate tax articles. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/child-benefit-tax-charge-calculator?embed=1" title="High Income Child Benefit Charge calculator by Tidy Sheets" width="100%" height="1250" style="width:100%;max-width:760px;height:1250px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/child-benefit-tax-charge-calculator">High Income Child Benefit Charge calculator</a> by Tidy Sheets</p> Copy code

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High Income Child Benefit Charge calculator by Tidy Sheets

Pension and adjusted net income calculator

Enter salary, self-employed, rental and savings income plus pension payments and Gift Aid to see adjusted net income for 2026-27, the Personal Allowance taper over £100,000, the High Income Child Benefit Charge and Tax-Free Childcare eligibility, and how much more pension would get under each threshold. Good for pensions, higher-rate tax and family-money articles. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/pension-adjusted-net-income-calculator?embed=1" title="Pension and adjusted net income calculator by Tidy Sheets" width="100%" height="1350" style="width:100%;max-width:760px;height:1350px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/pension-adjusted-net-income-calculator">Pension and adjusted net income calculator</a> by Tidy Sheets</p> Copy code

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Pension and adjusted net income calculator by Tidy Sheets

Tax set-aside calculator

Self-employed readers enter their expected profit to see estimated income tax and Class 4 National Insurance, a suggested monthly amount to put aside, and what payments on account might look like. Ideal for freelancer, sole trader and side-hustle content. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/tax-set-aside-calculator?embed=1" title="Tax set-aside calculator by Tidy Sheets" width="100%" height="600" style="width:100%;max-width:760px;height:600px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/tax-set-aside-calculator">Tax set-aside calculator</a> by Tidy Sheets</p> Copy code

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Tax set-aside calculator by Tidy Sheets

Rental income tax calculator

Landlords enter rent, expenses, mortgage interest and other income to compare actual expenses with the £1,000 property allowance, including the 20% finance-cost tax credit, and see the extra income tax on their rental profit. Suits landlord, buy-to-let and property blogs. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/rental-income-tax-calculator?embed=1" title="Rental income tax calculator by Tidy Sheets" width="100%" height="850" style="width:100%;max-width:760px;height:850px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/rental-income-tax-calculator">Rental income tax calculator</a> by Tidy Sheets</p> Copy code

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Rental income tax calculator by Tidy Sheets

Late payment interest calculator

Freelancers and small businesses enter an unpaid invoice and dates to work out statutory late payment interest (8% above the Bank of England base rate) plus the fixed compensation they can add. Great for freelancing, invoicing and small-business posts. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/late-payment-interest-calculator?embed=1" title="Late payment interest calculator by Tidy Sheets" width="100%" height="680" style="width:100%;max-width:760px;height:680px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/late-payment-interest-calculator">Late payment interest calculator</a> by Tidy Sheets</p> Copy code

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Late payment interest calculator by Tidy Sheets

Bills monthly cost calculator

Readers add their Council Tax, energy, broadband, insurance and subscriptions, whether they're paid weekly, every 4 weeks, monthly, quarterly or yearly, and see one true monthly and yearly total. Perfect for budgeting, cost-of-living and money-saving posts. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/bills-monthly-cost-calculator?embed=1" title="Bills monthly cost calculator by Tidy Sheets" width="100%" height="660" style="width:100%;max-width:760px;height:660px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/bills-monthly-cost-calculator">Bills monthly cost calculator</a> by Tidy Sheets</p> Copy code

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Bills monthly cost calculator by Tidy Sheets

Dividend tax calculator

Readers enter their salary and dividends to see their 2026-27 (or 2025-26) dividend tax at 10.75%, 35.75% and 39.35%, how the £500 dividend allowance and each band are used, their effective rate and whether they need Self Assessment. Ideal for contractor, limited company, accountancy and investing posts. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/dividend-tax-calculator?embed=1" title="Dividend tax calculator by Tidy Sheets" width="100%" height="840" style="width:100%;max-width:760px;height:840px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/dividend-tax-calculator">Dividend tax calculator</a> by Tidy Sheets</p> Copy code

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Dividend tax calculator by Tidy Sheets

Take-home pay calculator

Readers enter their yearly or monthly salary to see their 2026-27 (or 2025-26) Income Tax, National Insurance, student loan (Plans 1, 2, 4, 5 and Postgraduate) and pension, and their take-home pay per year, month and week, with a marginal rate and £100,000 taper note. Ideal for careers, jobs, graduate, payroll and personal finance posts. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/take-home-pay-calculator?embed=1" title="Take-home pay calculator by Tidy Sheets" width="100%" height="920" style="width:100%;max-width:760px;height:920px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/take-home-pay-calculator">Take-home pay calculator</a> by Tidy Sheets</p> Copy code

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Take-home pay calculator by Tidy Sheets

VAT calculator and £90,000 threshold checker

Readers add VAT to a net price or remove it from a VAT-inclusive price at 20%, 5%, 0% or a custom rate (nearest-penny or round-down rounding), then check their rolling 12-month taxable turnover against the £90,000 VAT registration threshold and the 30-day rule, with their GOV.UK registration deadline and effective date. Ideal for small business, ecommerce, freelancing, bookkeeping and accountancy posts. Open the full calculator.

Copy this code into an HTML or "Custom HTML" block <iframe src="https://tidysheets-uk.pages.dev/vat-calculator?embed=1" title="UK VAT calculator by Tidy Sheets" width="100%" height="1500" style="width:100%;max-width:760px;height:1500px;border:1px solid #e5ecea;border-radius:12px" loading="lazy"></iframe> <p style="font:14px/1.4 system-ui,sans-serif;margin:6px 0 18px"><a href="https://tidysheets-uk.pages.dev/vat-calculator">UK VAT calculator</a> by Tidy Sheets</p> Copy code

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UK VAT calculator by Tidy Sheets

Optional: automatic height

Each calculator reports its height to the page it's embedded in. If your site allows scripts, paste this once anywhere on the page and the frame will grow or shrink to fit, with no inner scrolling:

<script>addEventListener("message",function(e){if(e.origin!=="https://tidysheets-uk.pages.dev"||!e.data||e.data.tidysheets!=="height")return;document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source)f.style.height=(e.data.h+4)+"px";});});</script> Copy code

Good to know

The calculators give general guidance only, not tax or financial advice, and say so on the page. They use the rules for England, Wales and Northern Ireland unless stated. Want a calculator we don't have yet? See all the free UK money calculators and guides, such as the Tax-Free Childcare guide and the £1,000 trading allowance guide.